Sore Neck After 90 Units of Botox? Am I Just Anxious?

If you received Dysport, 90 units would be an average dose for these areas.  However, if you actually received Botox, this seems a bit excessive.  Regardless of the feedback from panel members, it would seem prudent to report this to your injector for further follow up.  Having peace of mind will be of benefit.

Your symptoms may not be related to the Botox. However, if the lump in your throat is, and the neck soreness, which would be unusual, then at seven days, the symptoms might have peaked and will improve. Regardless you should see a neurologist for an evaluation and let your doctor who injected you with the botox know of your situation.

To give you some perspective, my typical treatment dose is 33 units of BOTOX.  So 90 units is significantly more than this by almost a factor of 3.  It is my experience that as the dose increases, so do systemic side effects.  This can include difficulty swallowing which you are interpreting as a "lump" in your throat.  The soreness in the neck may be due to activation of compensatory muscles that you don't typically use.  Based on your symptoms and the size of the dose of BOTOX you received, it is reasonable to assume that all of your symptoms are due to the systemic side effects of BOTOX.  These symptoms are very bothersome to individuals who experience them and can last several months.  

Obviously, don't have a treatment this large again.  Talk with your doctor about what is going on.  Recognize that he or she may never have seen this type of complication before.  You injecting physician may try to dismiss your symptoms.  If necessary, see a neurologist for an assessment.  While there is no specific treatment, there are some steps that can be taken such as sleeping sitting up or tilting up your bed which can help some of the night time symptoms.  The anxiety is present because your body is dealing with low grade botulism poisoning.  Because your symptoms might get a little worse, I strongly recommend that you contact your personal internist for advice and appropriate referrals if the physician who did your treatment is not prepared to take your symptoms seriously.

You will get better with the support of your doctors but your concern is totally appropriate.

90 units is almost an entire bottle of Botox (100 units) and is a large dose.  The sore throat and sore neck may be a side effect to the Botox and if not resolved in a day or so you might consider asking the MD that did the Botox injection.