Hey Sunshine,
I have used Humira. In the beginning I had some relief. Although there seemed to be a period of days just before, and after the shot, that I would feel the symptoms intensify.
I don't think there were too many immediate side effects that I can recall, aside from the weakened immune system. There was a subtle change in my skin tone.. Don't really know why.
I also tried both the syringe, and the pens. For me, the syringe was better. This was because I had some terrible anxiety from the pen, and the impact of the injection. The pen would impact my skin so hard that it would bruise my belly most every time I gave myself a shot. This caused me to flinch a few times, wasting the pen.. you only get one shot with the pen, if you miss, goodbye humira dose... Been there, done that.
I don't know if anyone else has experienced this: After about a year and a half on the stuff, I started to notice a strange feeling in the lymph nodes in my neck. They were becoming larger, and harder to the touch. It also was losing it's efficacy over time. I ended up taking a shot every week, rather than every two weeks, at about 14, or 16 months. A few months after doubling my dose frequency, it lost it's benefit altogether.
Once I was off the Humira, it was a couple of months before my lymph nodes felt more normal. I also went through a terrible resurgence of symptoms.
I hope, for your sake, it goes better for you than it did for me.