Hi Mick,
you probably won't be able to get DMPS in Eygpt because you need a doctor who can administer DMPS through a script. DMSA will chelate both lead and mercury. DMSA is very good for lead issues. DMPS will chelate both mercury and arsenic, but not lead. ALA will chelate mercury and arsenic. Hopefully you've had your Amalgams out for at least 3months before starting to chelate with ALA. You should really start with a low dose of ALA like 5mg, 6.25mg's at least. When you have adrenal and thyroid problems related to mercury its best to start slow and low, then gradually build up. A higher dose could cause more stress to your adrenals, so a much lower dose may be required. Stay at a low dose for as long as you can. Its the best option you have.