The symptoms you describe might be due to parasites. Many here have had parasites. You might have mercury toxicity as well as parasites(being mercury toxic makes one much more succeptible to parasites). The first thing I advise new people here to do is a one month parasite cleanse. It is easy and inexpensive. Some people see evidence of parasites while doing the cleanse, while others just feel better after doing it. The parasite cleanse should have at least these 3 herbs-wormwood, black walnut green hull extract, and cloves. These herbs are also very antifungal.
After doing the cleanse for a month, wait at least 4 months before doing the cleanse again, as wormwood can be toxic if taken for too long or in too large a quantity. If you see evidence of parasites, you can take herbs or prescription medicine that works well to combat that specific parasite. You can also eat a clove(section) of raw garlic after each meal to make the parasite cleanse even more effective.

As for chelation, the consensus here is that the Cutler protocol using ALA and DMSA is the best and safest method, however it requires getting up in the middle of the night to take a dose(low doses of ALA and DMSA are taken every 3 hours for at least 3 days in a row, then at least 3 days off, then repat the cycle).

There are many supplements you can take to help with detoxification. Adding commonly available herbs and spices such as ginger, danelion, turmeric, and cayenne to your diet can help. I like the Triple Leaf Detox Tea. I also use the Yogi Detox Tea as well as licorice root tea to help with detoxification. Licorice root is amazing stuff.

http://www.herbwisdom.com/herb-licorice-root.html

you should read through the forum for ideas about other herbs to take, and which vitamins and minerals to take. Magnesium malate, vitamin c, and B vitamins are particularly important.