Botox is a great injection for reducing these lines around the face. Botox is not known to cause the side effects that you are describing. I would definitely consult your internist or an ENT for examination. Best, Dr. Green
Your logic is very well founded. If your primary concern was a wide jawline then Botox would be the treatment of choice, however for the nasolabial folds correction the same does not apply. Hope this is helpful.
Botox is a fabulous procedure but will not change the anatomy of your face to give you a larger forehead. I think your forehead is in proportion to your face and I would not try to change it. Best, Dr. Green