DH (early 30s) as had various health issues since I've known him. Chronic migraines, digestive issues, allergies. No diagnosis has ever been found and the GPs don't seem to take him seriously. A lot of his issues flare up every so often so he does have periods better than others.
Last year we all had some sort of flu/Covid thing and he never seemed to properly recover. He was very weak and tired so I guessed long Covid. He'd get chest pain and extremely breathless on exertion. It was six months after we were ill and he was often barely able to walk across the room. GPs looked into his heart due to family history. A couple of things showed on the echocardiogram but they were marked trivial and GP doesn't believe they'd cause his symptoms. In fact I fear GP doesn't believe his symptoms full stop.
He takes antidepressants and has tried therapy several times. I do not believe it is caused by anxiety primarily because it seems the opposite. Generally he will be doing really well and be happy and then it'll hit him again and over time it gets him down.
The last few days after things seemed to be improving they've got worse again. He's started suddenly getting extreme fatigue out of nowhere especially in the late afternoon/early evening. He will be fine all day then it will just hit him out of nowhere. When it happens he says he feels like he's going to pass out and he looks really unwell and not right. He starts feeling "tingling" in his fingers. His oxygen saturation and blood pressure are fine when this happens. I'm used to his many symptoms but seeing this is quite concerning.
It's now happened for two afternoons in a row. I kind of want him to try the GP again and he's agreed but is worried that it will further solidify the idea it's all in his head if they can't find what it is.
I'm obviously not asking for anyone to diagnose him but wondering if anyone's able to guide with what types of things it might be and what tests to push for if needed.