Is severity of withdrawal from antipsychotics linked to duration of use or just dosage? Will taking a low dose have the same effect after 1yr as 1mnth?

Duration matters. But that's a general statement. Each drug, each person, other conditions, other medications all matter too. It's best if you have a relationship w/ the prescribing doctor from the start, but now is a good time to try to create one if you don't. They might help you do this most safely and effectively. I wish more people though ahead about this issue, but... Thinking later is better than not at all.