My advice to you is… Cut yourself some slack if you’re having trouble being motivated. If you don’t have the energy to take a shower try brushing your teeth. Do what you can now and do more as you get stronger.
My advice to you is… Don’t judge how you’re doing by how others appear to be doing. We only see what people show us and many people hide their sorrows. The only person that can determine how you need to deal with your loss is you.