Awful taste and smell for months

In late August, I went to the movies and when I ate the popcorn, it had a really strange chemical/metal kind of taste. I thought that the popcorn was just off, but my friend said it tasted fine.

Between then and now, I’ve continued to experience that taste at random, but now things smell the same way. It can be random food items and it doesn’t stay consistent, so it doesn’t seem like any one item in particular.

My poop also smells like this, always.

I lost my job and subsequently, my health insurance, so I’ve been trying to wait this one out. However, it’s starting to impact my weight and coupled with already having stomach issues, I’ve started to get too thin (and I’ve struggled my adult life with being too heavy). It seems to be getting worse and almost everything tastes terrible right now.

Please help! Thanks in advance!