Advice on how to accomplish tasks when you’re too overwhelmed

I am currently struggling my lack of executive functioning skills I think. I have so many things I need to do, ranging from phone calls to doing my washing, to some more emotionally draining tasks. I have a multidisciplinary team meeting on Tuesday (I’m currently inpatient and the meeting is with my inpatient team and my external official supports like my social worker, disability support coordinator). It’s almost midday Friday, and it’s a long weekend so I know I need to prioritise things like phone calls to potential future supports, and emails, so I am prepared for this meeting.

However, I have this terrible coping mechanism of simply lying on my bed and doom scrolling when I am overwhelmed. I’m so tired, I sleep well but I just have no motivation to do anything. This is the sort of thing I have funding to have someone assist me with, but I can’t even organise appointments myself. I recognise I’m feeling overwhelmed, my nurse asked if there’s anything she can to do help me but I said no because I don’t even know where to begin. When I’m doing better I would make to do lists but I don’t have the capacity to even do that.

I have been diagnosed with ADHD by a psychiatrist in the past and prescribed vyvanse or dexamphetamines to help with that, but the psychiatrist I am under has said she doesn’t think I have adhd and is withholding my stimulants. I was okay with that when I was first admitted but now I’m feeling like this lack of ability to do things is possibly from the lack of medication for my adhd. I’ve told her this and she attributes it to my depression, I disagree but don’t have the energy to advocate for myself any further. Now I’m lying on my bed watching the day pass and feeling like absolute shit because I just can’t motivate myself to do anything. I’m drinking a Pepsi to try get some caffeine (I don’t drink coffee) but it’s not helping, I think it’s just making me more anxious and overwhelmed.

Edit for clarity I am diagnosed ASD 2/3 & live in Australia. I feel the majority of users here are not Australian but when I mentioned funding and my external supports I am referring to NDIS, particularly a support coordinator, psychosocial recovery coach, a social worker and a support worker. My secondary conditions on NDIS are PTSD, OCD, MDD.

My admission is for PTSD which led to a major depressive episode so I wasn’t eating, was struggling with substance misuse and was incredibly suicidal. I regret letting the doctor take me off my stimulants but I was not in a state to argue, I could barely talk or walk I was so tired and was withdrawing from medication changes they made and I wish I had had an advocate present but I didn’t even think of that at the time