What Causes Abdominal Pain And Tiredness After Bleeding?

My age 39.last year 26. 10. 2014 myomectomy surgery. Then after 3 months . i ll try to pregnancy. i take inj. Before take tab. Siphene -5 days. Inj. HCG 7500. Tab. Primowal- 10 days. Pregnancy symptoms before 28 days. Lmp 26th may 2015. But 29th day bleeding in red colour started. Then no continue bleeding . but 2 days bleeding. Suddenly stop bleeding midnite for 3rd day morning 10am. But now headache start, abdomen pain, shoulder, neck pain, and some different changes in my body. tiredness, mild giddiness, no concentrate other works. (But , everyday mornibg i drink coffee). everytime sleep, rest on bed. So, im confused. Please tell me detaily explain me sir. Regards, Jk