Help! Blocks getting super bad and more frequent.

Help! Blocks getting super bad and more frequent. So I work as a Medical Representative for a MNC in an Asian country, I've been in this job for 5 months. I never had an easy time to be honest but lately I'm finding it really hard to even just introduce myself and the company in front of the doctor. I don't know what went wrong, it was decent at the beginning but now I'm finding it really hard to just survive because I can't fucking introduce myself properly and build a good friendly relationship with them. It's not that I stutter like in cartoons, when I enter the chamber sometimes I get stuck saying my name or my company's name. That's it. Stuck. Done. I've to deprive myself of oxygen to let those words out. Just imagine doing that infront of a doctor. I'm tired! There's one more thing, if I want to switch my company in the future, I've to first check if I can properly pronounce the company name first. It's ridiculous. Everywhere I go, I'm dealt with these impossible problems which force me to think, if I could just solve this problem of stuttering I would have had much better life experience. Sales pressure aside, I've one more thing to worry about. It's too much. I don't know what to do, I read out daily, I've tried that vitamin b1 magnesium combination thingy, nothing seems to work. My future looks bleak. Sorry if my post made you depressed. I'm really sorry.