Yes, prices will vary greatly, Usually the Plastic Surgeons charge the most, then the Derm, then other docs like myself, then the nurses. Overall, If the price is too good to be true, you should skip it. Deals from those coupon sites are usually bad.
You're fine. It won't be a problem. The class of antibiotics that interact with botox is different.
As others have mentioned, your forehead shape is fine, at least from the pics, that you'd sent. What stands out more is your uneven skin tone from acne. I would take care of that in order for it to look even and smooth.
I assume what you mean by a triangular jawline you mean your face is triangular from the front? If this is the case then you can do something to give you volume to your jaw. As others have suggested, fillers work great for that.
Yes, unfortunately, that can happen, flu- like, cold-like or seasonal allergy-like symptoms can occur. some people get swollen eyes, runny nose, slight fever chills and sweats too. It will go away.
