Well, firstly I want to state that I'm clearly not a "doctor". Which is really ultimately who you should see if you want something to be prescribed to you.
Secondly, I can really see that anyone asking such questions does not fully get fruitarianism yet.
The thing wrong with the whole specific question "What should I eat?", is that it supposes that somebody somewhere has a better idea of what one should eat than you yourself do. And you are truly mistaken if you think that to be so.
The simplicity of true fruitarianism is that a fruit diet is by it's very nature cleansing and healing, thus whatever it is that might be unsettling you, dis-ease-ing, bothering or generally plaguing you, provided things haven't been pushed beyond a theoretical point of no return, then adopting a fruit only diet will eventually render things right once more. Or as right as the body is capable of becoming..
Thus, if your eyes are brown because of any previously health degrading diet, then eating fruit will eventually clean things up to the point where if you live long enough you're eyes will once more return to the colour they should be..
"How long will that take?" Is the question I then get asked.. But how can I or anyone else possibly know the answer to that? Especially when we all have such specifically differing histories, different ages, states of health, varying genetic backgrounds, different living environments, etc etc. The truth is, changing ones diet to all fruit may still not be solely enough to attain the results one would like to see. For instance, one's eye colour may naturally be brown, and no amount of cleansing will alter that, or ones living and working environment may be so polluted that results may be much slower in occurring, or ultimately hindered or prevented until one makes changes or moves out from whatever circumstances one is in..
Live in a clean environment, and adopt a steady fruit diet, and I believe within weeks one will see results already, within months most semi-serious afflictions should be history, and within a year or more, you should be content with your path and singing the praises of the fruit only diet..
But the truth is, there are all manner of obstacles that stand in our way toward that one year goal. - Addiction and cravings being likely foremost, and it is unlikely that few will be capable of adopting and sticking to a purely fruit diet. Then socially we will be under a lot of pressure to stop being stupid and eat more sensibly, and if you don't have strength of character and conviction that what you are doing is right, then of course failure at fruitarianism is a likely result.
Don't take my word for it. I am not really telling you that fruit is right, and will definitely help you out. Quite frankly I don't want that responsibility. This is not to say that I personally don't believe what I'm writing. I have 100% faith in what I talk about, but that still doesn't make me right. Perhaps I have grossly erred. That is for you and you alone to decide..
So back to the specifics.. Why can't I help on which specific fruits are best for any given occasion? Well, the truth is that much as I believe human physiology is basically the same for every individual human on the planet (thus I personally have no doubt that a 100% fruit fruitarian diet is ultimately the correct diet for all humans), the specifics at any given point in time can vary greatly. Thus if I'm hungry right now, and the thing that appeals most is orange juice, then orange juice is what I should eat/drink.. But it would be complete folly for me to think that that is what you need right now too.. You need to go for what your own inner body intelligence and wisdom tells you is right. Don't listen to anyone else.. Not even me. Especially not me, I'm just some has been IBM system programmer..
Of course, you might think that macdonalds is what you truly desire, but I am obviously talking within the boundaries of fruitarianism. So when I say eat what appeals most, I mean eat whichever fruit appeals most, and you can be sure (or at least, I can! - it may take a while for you to personally gain such certainty, or you may never do so, the choice is yours!), that that fruit is the one that you need to be eating right now, and that that fruit is the one which is ultimately speeding you on the way to your goals.