Hi, sorry to hear of your current problems. The acid may be acid reflux which would be unrelated to MS unless it was caused by something you could not or did not properly swallow. I have to sleep propped up on a slight incline, otherwise I have acid problems as well as choking problems. I have slept this way since 2004 and have never had the problem return.
Your swelling could be from your weather or your diet or both. You might try placing your arm up slightly to see if it helps reduce the swelling. You should also look at the foods you eat.
Inflammatory foods can include:
Sugars, common cooking oils, trans-fats, many dairy products (not all), beef, dark meat (venison and bison is ok), processed meat, alcohol, refined grains (white rice, white flour, products made with white rice or white flour), MSG, and any foods for which you might have an allergy. Removing this list of products from your diet might help. I try to follow the Swank Diet. After 1 year of no beef, I tried it, but I decided I did not need it. I eat venison, pork (white portion), Chicken Breast (no dark), Turkey (no dark), rabbit, fish......
You might also try immersing your arm in cold water or using an ice pack. Remember when using an ice pack to protect your skin from damage (I wrap a towel around my limb before applying an ice pack).
Monday will soon be here. Try to relax and focus on other things. Many have experienced or are experiencing what you are going through- it does get better!!!!!!