Welcome to the forum.
By only having to cook for yourself you have a big advantage in that you can chose the foods that suit your needs. Which foods affect your gastro problem? ... and about how tall are you ... I'm guessing about 5'2" ?
In my case I'm trying to shift about 80kg (which is more than you weigh
) - I only have to look after myself now, so I can eat pretty much what I like - or at least what I know I need to eat. I'm one year older than you.
My usual pattern is:
Breakfast - 2 toast with an egg, or baked beans (sometimes I might have oats,nuts, fruit and yoghurt) Lunch - Salad wrap with either fetta, cheddar, tuna, or chicken Dinner - fruit and nuts (sometimes with some fetta) sometimes I have a meal replacement shake instead. My exercise at the moment is 12minutes on the exercise bike twice a day, but I'm building it up gradually. I swing a couple of dumb bells around once a day. I'm hoping that when I've lost another 10-20kg I will be able to walk a bit, something which is restricted at the moment because of weight/back problems - I have only lost 10kg but I can already feel the difference - the mirror hasn't caught up yet.
My regime is not for everyone, but there are some very experienced and knowledgeable people on this forum who will be able to point you in the right direction for your circumstances.
All the best