I've been in your footsteps, but only about 8 months ago. I am also 18, and I noticed my hair falling out. I was devistated thinking, c'mon i'm young, I don't need this! I'll tell you some things you can try. Now, of course you know theres a handful of hair products out there. I use/used kevis (
www.Kevis.Com), was I sceptical? Hell yeah I was, but you know what. After about... 5 days I noticed much less hair falling out, and after a couple weeks, it stopped falling out completely. I was amazed as hell, but the key thing is you have to use to product right. Here is another thing, you seem very stressed out about this, and this is natural, so was i. What you got to do is relax, the more stress you put on yourself, the worse it'll get. Try this also, this may sound silly, but hey it helps alot. Another reason why hair falls out is lack of circulation to the scalp, being stressed can also reduce circulation. What I do after ever time I take a shower is massage my scalp, it'll increase blood flow and promote healtier hair. I actually lay on my bed with my head hanging over the side so i'm hanging somewhat upside down. I'm not 100% sure if that helps but I do know that blood rushes to my head so hey, couldn't hurt (just don't pass out or anything, lol). But yes, i've been using that kevis product for maybe 6-7 months and I can actually see hair growth where I did not expect hair to ever come back (hairline). I hope this proved to be useful. And you only need to use the product for a year to receive full benefits, sure it's a bit pricey but theres no drugs that will mess with your body, it's all topical. Propecia is a common hairloss drug, but you have to take a pill a day for the rest of your life! And if you stop, your hair will eventually fall back out(and theres no proof that it works on hairlines). There are sexual side effects that are very common and sometimes devistating with that drug as well.
Good luck!