Muscle numbness

This is a general question, it’s been a long time since I have worked out. I recently started back up 2 weeks ago and have been consistent. Every time I work out the muscle or muscles I am working out go completely numb by my second workout.

I don’t feel anything I can hardly feel my muscle working. It gets so bad I can’t even do 10 pounds because my muscle will give out.

The very next day I may be a little sore but I have almost not pain today after working triceps. It makes me upset because I know I’m not done but my body says I am.

What is causing this odd muscle numbness ? Should I see a doctor and get checked out ?