Have you got a bg monitor yet? That's the best way of seeing for yourself what certain foods and exercise do to your body. We are all different.
And going low carb isn't salads for ever more. In pubs I tend to go for steak or burger (with cheese and bacon) and swap chips for some salad or veg. Or fish and veg, or ploughman's and leave most of the bread. Or have 2 starters instead of a main. Or ham, egg and a very few chips
The key thing is once your used to it, you'll be surprised how filling and tasty low carb is. It's not deprivation, its finding a way of eating for life that suits your body and your life.
Are you following the several threads on here where people post their daily food? Loads of ideas to copy.
And it's up to you how strict you want to be, there's no rules, it's your body. Me, I'm retrying to keep my eyesight and having seen how a pie raises my bg, can quite happily say no, but I do succumb to the odd ice cream.
Yes, a walk after food will probably help. Only a meter will show how much or how little