Good Morning,Yes I switched meds from one to the other without problems. I have to ask why you are switching from amitriplyline to Zoloft ?
Congrats on the weight gain and keep it up. Getting on to one of the SSRI meds usually comes with some side effects but be patient knowing that you may have some rough days before things get better.
Allow yourself time to just adjust to the med and don't set to many expectations on yourself the next couple of weeks.
Keep on talking with us and know we are here to support you.
Kindly,
Kitt