growstuff
Maw I feel that you're being harsh. The OP has begun to take control and has asked for advice. It would appear that she's already acted on some of it by checking her current situation, which is a start. She now has decisions to make. Quite honestly, she'd be foolish to act without question based on some anonymous comments on the internet.
I don’t mean to sound harsh, but realistic.
OP is young enough and in good enough health - unlike many - to do something about it and many helpful suggestions have been given.
Wringing one’s hands and worrying about 15 years hence is not, as my mum would have said, going to get the baby bathed. There is no certainty that OP’s DH will predecease her, nobody knows what the future will bring, but I do know we only get one shot at this life and if we don’t make the best of it, we can’t be surprised by the outcome. It would be a different matter if OP was coming up to retirement age, or unable to work through ill health.
Another ‘Bon mot’ from my schooldays is “Fail to,prepare, prepare to fail”.