I take a hot bath in Epsom salt, the muscule relief one. I also rotate between Tylenol and ibuprofen. Heating pad and ice packs help rotate those as well.

Tired while standing could be POTS or another form of dysautonomia. If you have this, you can increase salt and water and do floor exercises. These will help condition you to be able to stand longer or walk without crashing.

Along with medications, salt tablets have helped me a lot with similar symptoms (POTS). I take 12 Vitassium buffered electrolyte salt capsules a day (~6g salt) on doctor's orders and it really helps a lot. Make sure to stay hydrated. I usually average about 100oz of water a day, and I've improved significantly.