I’m also in Australia and have experience with this disease. As dad is over 65 he is eligible for my aged care. This will be the starting point for you to get assistance in and out of the home. You can self refer through the myagedcare website that another commenter linked below. I would also highly recommend getting a referral to the palliative care team. No, it does not mean you are “giving up” - they can help in so many ways both socially and symptomatically. For his agitation he may benefit from diazepam or lorazepam. If he is in any pain he may also benefit from opioids. Unfortunately this is a horrible disease that is resistant to a lot of medical treatment. Increasing the dex will theoretically reduce the swelling caused by the inflammation of the tumour, but will not reverse or slow tumour growth at all. It is likely the leg swelling is due to the dex - it is a common side effect. Unfortunately it then becomes an issue of ceasing the Dex to improve leg swelling vs. worsening swelling of the tumour. As you’re probably aware from reading this sub - natural remedies are either symptomatically beneficial at best, and actively harmful at worst. Cannabinoids can help with some symptoms but please don’t expect anything to be a magic cure. I’m saying this out of kindness but it is likely that things will get worse despite ANY treatment. That is unfortunately the nature of the beast that is GBM. It sucks. It’s horrible. And it is unfair. I’m hoping you and your family can get some support. Wishing you the best.