You could try low dose diphenhydramine, That's Benadryl here in the States and it's an over the counter antihistamine. I'm not sure about South Africa.
If you can get diphenhydramine try 1 mg per 40 lbs of body weight ( or - 10 lbs) at meal and bed times. I use the children's liquid and use 2 ml diluted for a dose of 5 mg but others use a quarter of the adult tablet for a 6.25 mg dose or a quarter of the children's tablet for a dose of 3.125 mg. If you cannot get Benadryl there over the counter I know of an MS patient in Sweden, where it is by prescription only, that get's his on ebay and it passed through customs there no problem.
Try low dose Benadryl 1 mg per 40 lbs ( or - 10) of body weight at meal and bed times and 1 or 2 doses during the night IF you awaken during the night. The easiest way to get the low doses is to use the children's liquid. 1 ml of the liquid is 2.5 mg
This treatment should be helpful for agent orange exposure, gulf war syndrome, PTSD, and MS
IF you should experience increasing fatigue, stop the treatment, and tell your doctor to look for a sodium channel channelopathy. These are rare and not many doctors even know they exist.
If you try this, make sure the VA doctors are aware of your improvements, which will be amazing, and have them forward the info to Dr. Beatrice Golomb. She did work on Gulf war Syndrome and now works for the VA, She should understand the connection right away if you include the following links: