At 42, missing periods for three to four months can point to early perimenopause or be linked to your autoimmune condition. A medicine to simply restart flow isn't the right first step here.
Next Steps
Ask your gynaecologist for a hormone panel and a pelvic ultrasound. These will show what's actually causing the change and help explain the discharge too.
Health Tips
Please don't self-start any period-inducing medicine, especially with your current medications and autoimmune history.