I'm not a college student--I'm a music teacher, but I wanted to comment on your post re: mercury. I also had mercury toxicity, and I was helped by detoxing with LL's Magnetic Clay baths, under the supervision of my MD. Chelation didn't work for me. The clay baths are a strong detox, though, and need to be done under the supervision of a heath practitioner, as detoxing too strongly from metals can throw more sensitive individuals into seizures. Also, you'll need to replace the lost minerals (they get pulled out with the mercury) in your body with supplementation of some sort after the bath. I felt a substantial improvement in mood and energy after this detox. My foot pain and TMJ pain also went away.
In my experience, CFS can be caused by any number of neurotoxin mediated illnesses, such as mold toxins, Lyme, Ciguatera (Florida), and Pfiesteria (parts of Maryland and Delaware). For some reason, these sorts of things cause mitochondrial dysfunction in the body, resulting in CFS. I recommend reading Ritchie Shoemaker's book, Desperation Medicine for an explanation of neurotoxin mediated illnesses, and Jacob Teitelbaum's book, From Fatigued to Fantastic for an explanation of the mechanisms at work in CFS.
In one college town I found 11 of 12 apartments with mold problems. Some mold does brain damage, some just causes fatigue. Mold likes to hide under sinks, in walls, on concrete slab, in ductwork, and in carpeting. If something has a must or moldy smell, there's mold there, even if it's microscopic. Tests from the hardware store can reveal type but not quantity. I got mold toxicity from an apartment and a basement.
Formaldehyde in new homes, new cars, and new carpeting can also cause CFS symptoms. It takes them about 10 years to off-gas from these toxic chemicals. I have extreme sensitivity to this.
Lyme tests are unreliable 60% of the time, because tests for Lyme are antibody tests, but seeing a Lyme Literate MD can help rule out Lyme as a cause. My Lyme wasn't diagnosed until 15 years after the tick bite. Bitten at age 14, I didn't know anything about ticks and thought nothing of it. My health gradually went downhill as time went on. If you do check for Lyme, also check for co-infections and mycoplasma, as these often contribute.
I hate to see young people suffer like you are. I feel like I lost the last 16 years of my life due to deteriorating health, and I don't think anyone else should have to experience that.
Best wishes on your journey toward health!