how can i control this weird thing going on with me?

[Franco]

i drink a pill that helps me for my acne and i have been doing well since a have been drinking it... about 3 months ago i started to notice that i was so concerned that it would stop working all of the sudden even though it was still working well. i started to notice that when i drink the pill i feel like something in my stomach stops it from working and i think about it so much that i feel like it is never going to work again and the Truth is.. that is not working anymore... and every time i drink the pill i get that same feeling in my stomach like it is stopping it from being digested and even my dermatologist is surprised that it is not working. and now every time i drink something or eat anything that i feel is going to be helpful for me in any way, not just to help my acne i get that feeling in my stomach that it is not digesting and my mind tells me that it is not working or what i eat is not digesting.. this is something weird that started happening to me a while back now and i don't know if i need to see a psychologist or something like that . is there anybody that can tell me how to control my own thinking and everything weird that is happening?