After Botox I Have One Eye That Will Only Open A Little Bit, What Should I Do?

Based on your description, you may have Botox that may have affected your levator aponeurosis, the structure that lifts your eyelid.  Although temporary, it can cause your eyelid to be difficult to raise.  The best way to treat it is with eye drops that reverse Botox, or to wait 3-4 months until the Botox is no longer effective, or both. 

Best of luck to you, and I hope you feel better!
 

You levator palpebra superioris muscle was accidentally treated with BOTOX.  Initially the incidence of this complication was about 5%.  However, experienced injectors have figured out how to treat patients with a substantially lower risk of developing ptosis.  In the right hands, these are very rare.  Conversely, this is much more common in inexperienced hands.

Iopodine ophthalmic solution is used as an off-label treatment for this condition.  However, it does not work for 100% of cases.  It is my experience that it is only effective in mildly paralytic levator palprebra superioris muscles.  It seems that when the drops do work when there is only about 4-6 weeks left before the BOTOX effect wears off.  If the drops do not work, you can expect that the eyelid heaviness may last 4 to 6 months before wearing off.

Consider seeing an oculoplastic surgeon who can assess your eyelid status and follow you while you recover.  Generally I find that patients do not stay with injectors who drop their eyelid.  I think this is appropriate and would encourage you to find a new doctor for doing your BOTOX.