Any one able to give me advice in regards to the problems I'm facing because of untreated ADHD?

Yes absolutely you are making the right decision. If someone needed insulin to function, that would be ok wouldn't it? So if you need another medication to function, go for it. It does not have to be forever, try it for a year and then reconsider if your life has not improved. There could be an element of depression in your condition too.