I was put on Zocor 40 mg. 3 weeks ago. I just had sugery 2 weeks ...

I was put on Zocor 40 mg. 3 weeks ago. I just had sugery 2 weeks ago, so I thought I was feeling this way due to my surgery & pain medications I was on. Then my hips started bothering me when I sleep,cause I usually sleep on my sides, now real fatiged , now out of breath, & my vision, I started hurting in eyelids , like preasure ,white blotches ,almost like trails in my vision. Cant seem to get up too quick ,like lightheadness ,almost like im going to black out.Why would any one put you on medication to help one problem, & cause so my others? I dont understand . I really dont!!!!!!!!