Shift.ms is better if you're logged in

I've run into the issue of people wanting instantaneous decisions from me but I struggle to process the information needed to make a decision, I need time and someone to listen to me talk through all the pro's and con's/ think everything through thoroughly to make sure I'm not missing a glaringly obvious problem. And the thing is people will then make it into I'm trying to waste their time and mess them around, how do I get anyone to understand that my cognition and processing are impacted by my MS and other conditions? I've tried to say what is up above but I'm told I'm "making up excuses" or "it's not that hard just make up your mind" and it's really getting to me. I don't understand what people want from me if I've tried to explain that my brain doesn't work the same as non disabled people, hell it doesn't even work the same as people who don't experience constant debilitating pain, headaches and nausea, the pain alone makes it hard to think of anything except from the pain and how much I'd love to just lay in bed all day with my shiatsu massager going and doubled up pain meds. What can I do, do I start yelling I HAVE BRAIN DAMAGE YOU TWAT at them or is there a better way to illustrate my issue?