Pain Medication not working after gastric bypass

I have severe pain due to my lupus, and fibromyalgia, I also suffer from migraines.  I had major intestanal blockage in May of this year and I am sitll in pain from that.  I find since my gastric bypass my medications are not affecting me as I know they should.  If I get an inter-muscular shot or through IV  it works great but taking them orally almost has little effect.  I am so tired of living like this have you heard of this problem before after gastric bypass, and if so any suggestions?

[Sandra Y, RPh]

Drug solubility and surface area for absorption are affected by gastric bypass procedures. By bypassing major portions of the small intestine you drastically reduce the surface area for absorption, therefore absorbing less oral medications into your system. Different routes of administration such as IV or IM may be needed for many patients to guarantee optimal drug therapy.