Experiencing Famotidine Side Effects - Need Advice

So I have been on Famotidine for about a month now. at first it was alright like first 5 days. I was prescribed this med alongside pantoprazole I've already been taking for 2 years, because I still was having heartburn frequently a few times a week and having to take Tums. First 5 days with famotidine was fine..but then for the next 2 weeks I was having heartburn every day...tho I didn't need Tums because it went away within a few minutes...it was annoying. then it subsided and I thought..mmk that's fine. But then I started to get leg cramps and aches daily and lasting all day. I googled and it was a side effect...then my sleep started to get a bit poor and I wake up super tired and not feeling fully rested, and I did before the medication. I also have noticed I have more unexplained chest aches and pains...at first I thought hmmm maybe it's just anxiety..but even when I'm not anxious I feel it but it does give me more anxiety. And my anxiety is more present now with this med. I had gotten it pretty well under control rarely experiencing it especially physical symptoms...but now since I've been on this med I am having them way more.... has anyone else experienced any of these symptoms when taking famotidine? I emailed my Dr last night to ask her if I could taper off of it because the GI Dr who put me on it isn't someone I see, it was after I had a colonoscopy done. 🤷🏽‍♀️ so what are all of your experiences with Famotidine?