ME/CFS Heaviness in body, head pressure and stomach gastritis/ulcers

Hello,
I have many symptoms, but want to focus on/particularly ease the following (in the order as follows):
-Gastritis, burning stomach (both when not eating and have eaten)
-Head pressure (inflammation of brain)
-Extreme exhaustion/lack of energy, the body feels like lead

I’m wondering about what homeopathic remedy/remedies to take for the above symptoms and for how long and in what order and/or combination.
I have been thinking about Belladonna, Arsenic Album and Nux Vomica. Tried just a few granules on separate days (on day each). Nux Vomica created within a few hours a reaction of feeling sick (a symptom I used to have) and feeling like I had the flue/influenza. Next time I tried it, it might have increased the burning sensation in my stomach or not/no reaction. Tried Arsenic Album briefly, seemed to increase sense of heaviness/exhaustion, so I stopped. Tried Belladonna, also just once, didn’t seem to get any reaction.

I have already seen an homeopath and she as most tries to find THE remedy, but it didn’t do anything at all.
I want help with the above symptoms, because those are most severe, acute and restricting.