@JoKalsbeek , good news you will hopefully get an official ASD diagnosis. A firm diagnosis is an acknowledgment of your neurodivergency. It will give you confidence to use your 'aspie superpowers'. And there are many

As for weight gain, **** that! I would feel the same way too. Weight gain associated with a drug would be a big no, no for me, unless it was either take the drug or die.
It sounds like you are super sensitive to any weird chemical going into your body. Are you better with natural alternatives?