After Botox for Migraine, Having Difficulty Swallowing, Chewing and Raising my Head from a Bent Position, Why is this Happening?

Of course these effects are from the BOTOX treatment.  It is true that there can be local spreading effects of BOTOX in a small radius.  However it is also true that larger treatments such as those associated with medical BOTOX treatment can be associated with significant and potentially life threatening systemic side effects, which is the subject of the BLACK BOX warning required by the FDA.  You are experiencing these side effects.  The higher the dose, the more significant the side effects.  If you are having trouble comfortably sleeping at night, some authorities advise propping up the head of the bed 30 degrees.  Some people find that they need to sleep sitting up all together.  Generally, these types of side effects may not be worth the migraine relief.  If the treatment did not relieve the migraines or only made a small difference, then these types of side effect are not worth experiencing for the clinical benefit.  Unfortuntately your systemic side effects could persist for many weeks.  I would avoid any other drugs that might cause respiratory depression.  This includes narcotics and alcohol.  If you have a personal internist, I strongly recommend you call his or her office and be evaluated for your symptoms.  That doctor might be able to assess you independently of the neurologist and may have different recommendations for your immediate situation.  Realself is not the practice of medicine.  Without an actual personal examination, it is impossible to know what you actually need.

BOTOX® generally affects muscles within a 1 - 1.5 cm radius of the injection site, so it is VERY unlikely that your symptoms are related to BOTOX® for headache.

You might have some unrelated problem, or perhaps it is just the power of suggestion where some people [after reading the package insert for a drug] start to feel that they are having some or all of the symptoms listed in the package insert.