It seems you are suffering from some form of dysbiosis. Not knowing your test results or what things you have tried so far, it is difficult to make suggestions. However, I would like to mention a few possibilities you might investigate further.
People who have had trouble with accutane generally do better with a supplement of carnitine. So, that is something to look into. If you try carnitine, don't overdo it. Too much is not good for you.
The lead poisoning suggests that you might need a supplement of PQQ (pyrroloquinoline quinone). It is available from LifeExtension. The PQQ should probably be taken with some Coenzyme Q10. The heavy exercise suggests that you might be low on taurine and glutamine. The taurine is of particular interest in your case, because it may help get rid of some of the anxiety.
Glutamine supplementation is commonly employed to get rid of leaky gut. However, be aware that it can cause constipation. It can sometimes make things worse because certain bacteria will turn it into harmful substances. The glutamine should probably be taken with PAK (pyridoxine alpha ketoglutarate) like in the Perque Endura product. (The combination is popular with athletes.)
If you are low on carnitine, PQQ, PAK and coenzyme Q10, then your mitochondria will be under a lot of strain. This will make it particularly difficult to get rid of infections like Candida.
There are several things that help get rid of Clostridia. If you haven't been able to conquer that problem, you could look into hyperbaric oxygen.
The fact that PQQ has something to do with lead poisoning is not well known at this point in time. So here is a reference. This article mentions the association between PQQ and lead poisoning.