Is not taking care of yourself considered si??

Reasoning:
I've had a head ache now for 3 weeks. It's not improving. Doc thought it was a sinus infection but I'm not so sure..... I just don't want to see the doc and get told that it's all in my head, when it clearly isn't.

Besides the head hurting... I've experienced some weird things.. rapid eye movement, muscle weakness, neck pain, fatigue, and it's impacting my driving.

About an hour ago, I don't know what happened, but it felt like the uncontrollable shaking from an anxiety attack, but I know it wasn't an attack...

I don't want to go anywhere, I'm not safe to drive right now, and I'm thinking that not getting help could be considered si, but I just don't know... what do I do, Where do I turn to? And when is it too late to get help??