Anal means you have pin worm than likely. It is one of the most common parasites people get. For now you can take a cotton ball put a drop
or two of Iodine on it and insert for some relief. The gas could be from
some parasite as well.
Zinc, chromium, vit E, selenium and b12 It is best that you divide the
dosage through out the day Zinc, chromium, selenium and b12 are all water
soluble therefore leave the body in 2 to 3 hours. Best taken after a meal
as you need digestive juices to enable your body to digest them. VE may
be help full for the leg crams, you may want to add calcium and magnesium
chelate as well. Your potassium could also be a problem with the legs.