I tested positive for a fairly rare parasite (strongyloides) and have had many of those same symptoms. I started taking Standard Process Wormwood complex and noticed some big changes right away both positive and negative. If you have any swelling in your groin area... anal itching, or outright skin streaks... you might also want to get this checked out by a medical doctor. Don't guess... it's important to know.
However, if it IS a parasite like I have, you will also need medication. These parasites enter the body through the skin, (usually the soles of the feet)... they can lay dormant for years, or they can suddenly molt and really populate quickly.. and they do cause itching and rashes... and they can disseminate almost anywhere in the body. I also had eyeball pain.
Personally, I think it's important to know if you actually have parasites, and if so, which one(s). You can spend a lot of money, and take a lot of herbs etc for no good reason. Or, if you have a serious parasite like I have... then you need medical attention to help you get rid of them. The herbs and diet will help... but you will require medication, too.