Seeking expert counseling is a sign of strength. A personal relationship with a caring professional is proven clinically effective.
I am so sorry to hear about your difficult situation. Perhaps the so called perfection had a fatal flaw that didn't come to light until the novelty of your sexual availability wore off. It is not that you are not very attractive and desirable. Rather it is because there are others who are also attractive and desirable, and offer variety, which you cannot offer.
I am not talking about flesh and blood women, of course, but about digital women available on porn sites and videos, available on demand.
I have seen this many times before. A man becomes addicted to porn, is a chronic masturbator, and spends his libido and reduces his desire from frequent masturbation. This would explain his lack of desire, his decrease in frequency of sex with you, and his attempt to increase his "libido" by taking this over-the-counter patent medication to compensate for his need to be able to be more available.
Frankly, it seems that he prefers the digital images. as he has nobody to please but himself. Furthermore, it is known that porn promotes a false idea of the perfect woman: submissive, willing to to anything, and always wanting to please her man. She has no needs, except the desire to please the man.
Your boyfriend will probably be too embarrassed to discuss this with you, and may not admit to his continuing addiction to porn and masturbation, particularly since it disgusts and terrifies you. It does not bother his digital fantasy women. They understand completely and satisfy his needs. They are not disgusted at all. You just don't understand.
If you wish to better understand this phenomenon, you can watch this video (divided into several clips) about the effects of porn on men.
If you want to try to save this relationship (and it may be difficult) then you will probably have to find a sex therapist (licensed therapist with additional certification), and with his agreement go to see her or him.
This is your best hope. If you can't change him, then you should consider finding someone who is into YOU and not porn and self-gratification.
Here are the videos:
A Drug Called Pornography
I wish you success.
Elliott Sewell, LPCC, NCC, CCMHC