ANDROGENETIC ALOPECIA

It means Hair loss or so I gather from some website.I guess Hair Loss must be one of most worrying things for most of males who crossed 25. I remember Andre agassi with great hair when I as kid. It is sad to see his bald head these days. No matter , how many girls try to convince me that Agassi is still hot, I refuse to believe that.
The other day I met my school friends.(Primary school) It was slightly uncomfortable to see each of them fat and with receding hairline.
Where do I stand? I am not fat yet. Except in the eyes of couple of jealous friends. ;) That doesn't mean I am muscular or anything like that. I just starve myself periodically to stay in the range of 73-76 kgs.
Let's talk about hair. A nightmare is when you have more hair on towel after shower than on your scalp. I am nowhere near that stage. But I see split ends, grey patches, weak hair and more than usual no of falling hair after each shower. Am I worried?
Let me come to that question later.
I gather that hair loss can be due to many reasons. Genetic, lack of protein, stress, chemotherapy, disease, ...
I can rule out most of causes. In my cases reasons boil out to be stress and lack of animal protein. (I am a vegan)
What should I do now? I can go for medicines available in US that prevent hair loss if not aid hair growth. Or I can add to my stress and aid hair loss. Negative spiral. :)
So what do I plan to do? Nothing. I still find no reasons to panic. I will consume more protein and reduce stress. ;)