Might not even be parasites. Might be meridian flare ups or nerological reflexes or structurally induced in the spine.
The parasites are easy to get rid of. Time consuming but relatively easy.
Go with Barefoots DeWormer and Humaworms antiparasite products.
If they are skin parasites the Humaworm is excelent at eliminating them and Barefoots DeWormer is excellennt at handling any digestive system parasites. Of course they both have some carry-over but will get the job done.
If you start right now you'll be fine long before next May. You can order my book and CD on my web site.