Ive had a partial hysterectomy when i was 34. when or how will i know when i am going through menopause. should i get blood work. im having a hard time with my weight my sleep schedule is off, having more frequent headaches?

Your symptoms could be due to premenopausal syndrome. Yes, you should see your family doctor or a GYN for a check up.

Your symptoms are consistent with beginning of menopause. It would be prudent to see a gynecologist as blood tests can confirm the impression. If your symptoms are troublesome, your gynecologist can prescribe medication to address those. Wish you good health!