might be due to estroven
. If you are taking only estroven, make sure that you also take progesterone
for at least 10-12 days a month to avoid bad effect of estrogen
on uterus. For nausea, you can take some antiemetics for 4-5 days & see if it improves & then discontinue antiemetics. Also you mentioned you are taking maximum dose of estroven, please don't take it in excess of prescribed dose. Panic attacks may sometimes occur during menopausal transition, just continue prescribed medicines & continue to enjoy your life.
Wish you good health.