For the past several months I have been having pain in my penis when I am erect. Penis has About 20-30% curve to the right from the base. What's next?

See a urologist. I recommend that you seek the advice of a urologist given that having pain while you have an erection is not normal.
Here are some... You're not alone for many men have suffered from what you well described, that is, Peyronie's disease., for which men need timely evaluation & counseling on when and how their Peyronie's could be treated conservatively or aggressively at what price and for what goals to accomplish, although the outcome of treatment may be disappointed for some. More? Seek evaluation and counseling timely. Best...