Amino Acids Can Help Various Symptoms, But Be Advised...

Amino acids may be available without a prescription, but they can have serious side effects. For example, if someone has the Herpes simplex virus, L-Argenine can induce a herpes attack. On the other hand, if one takes L-Lysine, one can prevent that same herpes attack. "NAC" or N-Acetyl Cysteine derives from L-Cysteine, which, as I understand it, should be taken with three times the amount of Vitamin C, or else the L-Cysteine can develop into kidney stones! I do not know if this is a danger with the N-Acetyl form, but I advise you to find out before you embark on any self-experimentation!

Now, I am not a medical practitioner, nutritionist, or dietitian, so I am not really authorized to give you suggestions on supplements. Since I myself do experiment with supplements, I will suggest that you do thorough research on this or any other supplement, and consult with a trained medical professional who is both well-versed in supplementation and sympathetic to their use. Many, if not most physicians that I have encountered are not in favor of laypeople experimenting with supplements, if only because many supplements are not stringently monitored for purity. I have personally experienced this with Niacin. The amount per capsule seemed to vary widely from bottle to bottle, which was immediately apparent because of the symptoms of high-dose Niacin. 

I do not have any personal experience, or anecdotal experience with this particular amino acid, but if you decide to try this, be sure to obtain a pharmaceutical grade product. It will cost more, but you'll be getting what you pay for. Best wishes on your recovery.