I fear to get Botox in my jawline, can it cause problems swallowing?

Mxndieu, I am assuming you got Botox in your masseter muscles. It is unlikely to have swallowing problems with such an injection (assuming the injection was done correctly). Furthermore, if you haven't had any issues up to now, you will not develop an issue from this injection. If you still have concerns, please see the provider you did your injections for reassurance.
Dr. Luong

Thank you for your question. It seems like that you treated the masseter muscles with Botox and although difficulty swallowing is a side affect from Botox, it is VERY rare specially due to where it was treated. Hope that helps, 
-Melody PAC