Hi Lisa, unfortunately, it's difficult to give any advice without much information. As you say, you've had a difficult year, which suggests that it has been reasonably stressful and this on its own can cause blood glucose variability without you specifically doing anything wrong.
Even with stress, you should start by getting a full blood panel done, including thyroid and coeliac checks. This will make sure that you have no deficiencies that could be affecting you.
Another point is hormones. As you don't say how old you are (and I can't see your profile), this can also play a factor in glucose levels.