I will attempt to reply here on the RA disease portion, since any immune imbalance that can be corrected will also likely help the other problems. First, RA is classed as an autoimmune disease, where the body's own antibodies are found to be attacking "self" cells and tissues.
Here is a overall basic diagram of the entire human immune system, showing the TH1 and TH2 sub-branches over on the left:
http://books.nap.edu/books/0309057973/xhtml/images/p20007cc6g432001.jpg
First question is when does the immune system not perform at good efficiency and balance, and the answer is 'when the terrain (body and all tissues) are ACIDIC'! So the very condition that allows diseases to invade prevents proper optimal functioning of immunity. That must be made right, back to an alkaline state, otherwise many remedies just won't take.
Best, simplest and cheapest remedy by far for restoring a high= alkaline pH is given by Ted here, under BICARBONATE FORMULA:
https://www.earthclinic.com/remedies/lemons.html#BICARBONATEFORMULA
On to some RA remedies:
French Maritime Pine bark extract aka Pycnogenol, or GSE instead:
http://www.thehealthierlife.co.uk/natural-health-articles/arthritis/pycnogenol-help-sufferers-knee-osteoarthritis-01022.html
When I asked him to elaborate, he told me that he'd never used grape seed extract (GSE) to treat arthritis because he'd never heard of using either GSE or Pycnogenol for arthritis symptoms. Dr. Spreen: 'My comment was due to the fact that, 1) Pycnogenol is expensive, and 2) grape seed extract (much cheaper and more ubiquitous) has been found to supply the same active ingredients. Both are famous for their antioxidant properties. '
Both contain about 40 similar compounds classed as OPCs, by the way as the active ingredients. Dr. Spreen noted that he would recommend 200mg per day of GSE, ...
Next possible nutrient to try for the RA is "ORGANIC GERMANIUM, aka Ge-132":
http://www.orthomolecular.org/library/jom/1987/pdf/1987-v02n02-p083.pdf
Note this article is from 1987! It's been quite well researched in Japan. It is very widely available on the net health stores and locally.
Third possibility is plant sterols/sterolins, available generically. Based on the biological activities described above, most studies to date have investigated the ability of plant sterols to control inflammation or induce a shift from a predominantly humoral immune response to a more protective cellular response (i. E. TH2 to TH1 shift)
These supplements take time, 1 to 3 months, and as shown may give only a percentage improvement. There's also possibility #4 niacinamide, widely available and cheap. There is a post under 'Trigger Finger' from OCT 5 on it for arthritis. Dosage is in there, too:
https://www.earthclinic.com/cures/trigger_finger.html#GF_47032