I feel muscle pain on the slightest effort, and I have bad taste in my mouth and also tiredness. .. I drink coffee just to keep up, and I hate it.

Need evaluation. You need to see your doctor to have this evaluated. There are too many things that can cause your symptoms including autoimmune/rheumatologic disease, hormone issues, metal poisoning, infections, sleep apnea...One thing for sure, these symptoms are not normal. See your doc, find the cause so you can treat it. Good luck.