Switching from Olanzapine to Aripiprazole

I've been on Olanzapine for maintenace ever since I had a Psychotic episode in 2017 which worked.
I haven't had another episode and only hear voices occasionally.
But it made me gain 34kg (americans that's 74.9 lbs) so I had a talk to my doctor who initally offered me an expensive diabeties drug I can't afford. I suggested changing antipsychotics to one with lower weight gain potential. So I'm switching to Aripiprazole

I'm a bit anxious as to what effect switching meds will have on me because i've been stable so long and don't want to relapse.
How have people found Aripiprazole for weight? I'm on 15mg.

First, I am not really familiar with these medications, but I congratulate you on 5 years without a major episode. I have friends that have taken Abilify.
You and your Doctor will monitor the new medication as a team and I hope that you do well with it.
If you notice anything odd like unexplained feelings of harming yourself or side-effects that interfere with your well-being, contact your doctor or pharmacist immediately.
I tried a new med that gave me itchy, swollen ankles (water retention) and diabetes runs in my family also. The doctor said to stop taking it immediately and was calling a new med into the pharmacy right away.
The body may go through an adjustment to the new med. I can understand your discomfort of trying something new, especially if the old one is familiar and seems to work so well. The doctor wouldn't suggest a change if he/she thought that it wouldn't be successful.
Again, you must speak up if you don't think it is working. You are the only gauge that your doctor has on whether it will be successful or not.
Good luck on the weight-loss. Some meds will do that.