Rent out your flat and see how the trip with your mum works out; you may find that long trips are not for you and at least you'll have your own place to return to.
If it works out for you, you'll have rental income and a place to return to in the future / sell if things are so fantastic that you'll be happy to travel for years but don't rely on you mum's place as a source of money in the future.
If it works out for you, you'll have rental income and a place to return to in the future / sell if things are so fantastic that you'll be happy to travel for years but don't rely on you mum's place as a source of money in the future.