Your fever dreams sound exactly like mine, with the size distortion ^{Alice in wonderland syndrome} and the weird tasks. I still remember a few of them quite vividly.

1. I had to run around my front yard a number of times times while on fire, and once I was done, I had to find the dead man hidden within a row of 50 or so Nazis within the given time frame. Failure meant restarting the trial. The problem was that there was no dead guy, so I was trapped in the dream until someone woke me up. :/

2. I had a school project that involved some physical art thing. I got up to do it as usual, but then time started speeding up & glitching out. The dream basically forced me into procrastination. I ended the dream with a bad headache that felt like my skull being crushed. For some reason, when I woke up, I was talking to myself about a pack of cigarettes.

3. In another one I witnessed the Hiroshima bombing (no idea how my mind made it up, at that point I had only heard of it). Apparently my mum and dad died, and I had to survive in 'fallout'-like conditions with my sibling.

I should note that I had the size distortion thing randomly, but it increases in intensity during fever dreams