I worry enough to be motivated to keep going - but beyond that no. I may be totally wrong, but my feeling is if I don't have complications now and I keep my levels good, then the risks of complications are much lower than they were. As others have said, I will worry about them if they happen but I can only control the here and now. To me this means:
Keeping my blood/sugar levels as close to normal as I can (they average around 7.5 a day now - 4 weeks or so ago it was spiking to 27+ and my first A1C was 122 (through the roof as my DSN said).
Keeping my cholesterol at a good level (mine was 0.1 higher than recommended when tested - but I have improved my diet and exercise since).
Keeping my blood pressure at a good level (mine was a little high at around 140/80 but seems to be lower now around 130/70 this morning).
Checking my feet every day and making sure they are moisturised (my own mix of Shea butter and Jojoba oil)
Reducing my carbs but not adding loads of fat back (I am not saying Keto doesn't work - but it's not for me - at least not yet). Reducing carbs for me means eating less than 150g a day (I was probably eating over 300g a day).
Eating more veggies and generally more fresh food instead of processed food
Eating less takeaways (they were common - now they are a special treat and even then there are only a few things I will have).
More exercise - I do some limited walking every day (I park my car a good 10-15 mins walk away from work) and have an "under the table" exercise bike that I use for about 30 mins most evenings.
Basically just what seems to me to be common sense. It seems to be working for me at the moment. I am losing weight too (had to make two new holes in my belt that previously had a spare hole) so that's a good bonus. I have changed my lifestyle a bit but nothing drastic. It's what I can do now, but apart from making changes that seem to make sense to me, I don't "worry" about it.
I should clarify though: when I say I don't worry about it, I mean generally. At times I really do worry about it, and about everything. Sometimes I do get a bit depressed about having to make these (to be honest small) changes to my life and some things I would like to do I cant do anymore (like eating far too many cakes!). When I feel down - I worry about everything including complications but that's not really the complications, its just that I worry about EVERYTHING then. It's not often though so I can live with it