Botox is great at giving you a forehead "lift" and giving the appearance of "opening the eyes". However, if placed incorrectly can leave you with a droop. The full effect, including the negative ones, should resolve in 3 to 4 months. For the best results please consult a board certified dermatologist with a great deal of experience with Botox.
I'm sorry to hear about this. These side effects should resolve
completely, generally by 3-4 months after your treatment.
and your normal looks will return. If you had your brow done, I would advise against doing it as it WILL lead to droopiness of your brows every time you get it. Its best for frowns, crow's feet and gummy smiles.
Botox is temporary, so if the forehead/brow heaviness started after Botox, it should resolve within the next few months. There is a balance that needs to be struck between softening forehead lines and drooping the brow too far down (think of a Roman shade). In the future, I suggest botox injections in the high forehead and judiciously placed filler, by an injector well versed in anatomy.
The forehead muscle is the only muscle holding up our eyebrows. If overinjected with Botox, the position of the brows may descend, giving the impression of the eyes appearing smaller and the lids feeling heavy. On the bright side, the effects of Botox are temporary and dissipate within 3 to 4 months of injection. Always see an experienced dermatologist or aesthetic surgeon (plastic, facial plastic, or oculoplastic) for achieving the most optimal results from your cosmetic injections.
Whether positive or negative effects from Botox are achieved, both will go away in about 3-4 months' time. So, yes, there aren't permanent effects from Botox and it will wear off in time.
"This answer has been solicited without seeing this patient and cannot
be held as true medical advice, but only opinion. Seek in-person
treatment with a trained medical professional for appropriate care."