It can be pretty hard to find the time to write. Life has a way of coming at you all at once. Family dramas, excessive workload, sickness - all of the above.
One of the things that has really saved me when things get hectic is the discovery that my laptop works fine on the bus. This gives me up to an hour a day during the week, and it all goes surprisingly well when I don't get distracted by people talking loudly on their mobile (first up against the wall when the revolution comes) or to each other right behind me. If you are prone to travel sickness, that would probably knock that one out.
If you are being beaten back even more, there are always those few minutes spent waiting for an elevator, or waiting for the bus or train. You can use those moments to dream away about your story, maybe flesh out a character, or if things are really grim, just feel good about the fact you are a writer.
Carry a notepad or electronic equivalent that you can slip easily into your laptop bag, pocket or purse. If you get into the right frame of mind, its amazing how productive you can be on the ideas front in very short slices of time. I personally love writing with pen on paper. Sitting down in a cafe with my English Breakfast tea (strong) and writing in my journal is a treat.
Feed the beast: Let yourself get immersed in good fiction, or visual story. Read things that excite you. Inspire yourself creatively. You can do that even you are unwell and too physically exhausted to sit in a chair. Try audio books if you need to be on the move. Get the creative juices flowing - you never know when that great new concept will hit you right between the eyes. I got my last one pulling up weeds.
Find your niche: Even in the most busy life there will be places you can find a calm moment - 'eyes in the storm'. My favourite is to escape to a local cafe. The development of an invisibility field is highly recommended:)
Use the mundane tasks of the day as brainstorming time - doing the dishes, sweeping the floor, ironing, painting, handyman stuff etc
How do you manage to fit in writing when things get crazy?