I was on Humira for 10 months. The injections burn going in, but they significantly improved my symptoms (most notably the abdominal pain). I ended up developing an allergy to the Humira and would get severe injection site reactions that lasted for weeks, despite a combination of antihistamines prior to the injection. So, unfortunately, I had to stop taking it.
Since stopping, I am now in a flare. I wish my body would have lasted longer on the Humira, as it really helped me. Good luck!