It's best to try to treat. Wasting time with doctors can be like shooting yourself in the foot with these things. That said ige can indicate parasites, it got my neurologist on board to thinking I have parasites even though there still isn't great other tests to do further but I am waiting on a pcr stool test to see if it can pick up anything whether viruses candida or any parasites. Even if it picked up one or two parasite that could help.
Also the blood tests can essentially give some hints. If they don't show anything it doesn't mean their not either but it's worth a try. Also no use in saying disseminated to people who don't know about parasites. Having them is simply enough. It may help to at least try all the blood tests you mentioned and maybe stool test from dgr labs and/or Parawellness.