Immune system tested low-functioning, c3 serum low

I've posted before about my health issues and have been continuing to investigate to find answers.

Without going into the whole shabang, the short version is that I've been very sick for the last 4.5 years and have had a hard time determining what's happening to me, mostly because of incompetent doctors that don't seem to give a sh*t.

Had some tests done by an immunologist showing that my immune function is very low, including my C3. Does anyone have experience/knowledge with this?

Doctor is suggesting this immune treatment where once every 4-5 weeks a nurse comes to my place and with IV get other people's immune system stuff. I don't remember the same of this treatment, something like immunoglobulin blah blah blah. Ha, sorry. Brain fog is one of my symptoms.

Diagnosed with: Meniere's, oscillopsia, fibromyalgia, low-blood pressure, IBS/Leaky Gut, chronic fatigue Tweet