I don't think you can see it like that. It's more like:
On day 1, can you prepare food, remembering that 'preparing food' means a simple meal for one using fresh ingredients (such as a cheese and tomato omelette)?
Can you take nutrition?
Do you need support to manage therapy? Can you wash and bathe?
Can you manage your toilet needs? Can you dress and undress? Can you communicate verbally? Can you read and understand symbols and signs? Engage with other people? Make budgeting decisions? Plan and follow a journey? Physically walk?
Then you have to consider that even on your bed bound day, presumably you are sipping water, even in small quantity? You are going to the toilet? You would be able to communicate that you are in pain?
Then, again, you need to consider each of the two recovery days and ask the questions all over again.
Then you need to consider how much of the day you experience the symptoms and if they are modified by your treatment.
I don't think that having headaches and dizziness, tiredness and lack of coordination is going to be enough to satisfy the descriptors.
I do understand. It sucks. I hate it. I'm between preventatives and am getting migraines on most days at the moment. The headache isn't the most disabling thing. It's the nausea, the brain fog, the lack of coordination, the dizziness.... It's horrible. But I don't think you will be able to get to the 50%.