Toprol-XL and allergy test

I started taking Toprol 4 months after having my baby. I never had High Blood Pressure until I was 2 months pregnant and It continued throughout my pregnancy. Four months after giving birth my BP kept creeping up so I went to my doctor and she prescribed 25mg of Toprol. I have been taking Toprol for a year and a half, I have gained over 20 pounds, I have felt like I have been walking in a fog, loss of concentration, been diagnosed with depression, I have slept at night but not feeling rested. I went off the meds for an allergy test and immediately realized that I was sleeping better and feeling rested, so I was monitoring my BP and It has been okay so I have stayed off the meds. I never realized that my problems could have been linked to this med until I went off the Toprol. My question is how long before the weight will come off. I was working out 5 days a week and watching what I ate for over 2 months while on the Toprol and no change. I am hoping that since I am off of Toprol I will start dropping a few pounds soon.