Hi Twee. I'm taking Effexor too, but I only started it a month or so ago. I have noticed a change. Things feel a lot more stable and I feel a lot more in control, most of the time. I do have some bad days, times, and whatever, which can be expected. My doctor increased my dosage from 75 mg to 150mg, which I'll be starting next week. I am wondering if it will have more of an effect.
I wish I could help you with more information, but I'm pretty new to it too. As for side effects, though, I didn't feel any. Only the first couple of days were really weird especially with my vision and ability to concentrate. After that, though, I was completely back to normal.
I hope it improves things, and let me know how it works out for you.