Oh the joys of being diabetic!
Our bodies are so individual, and react so individually. For some people, stress makes their numbers go into the stratosphere; yet for others, stress actually makes their numbers go down. If your body responds to stress by tensing all your muscles, it's actually doing a weird form of "exercise" which can cause you to go low.
You may need to reduce your basal insulin, or your bolus insulin doses, or both. Also, keep a record of what times of the day you typically go low, and any connections to those times (after meals, before bedtime, before breakfast, etc.) and see if there's any pattern. Hopefully your doctor will help you work out a better regimen re the insulin doses.
And...sorry to hear about your mother's dementia. That's a tough illness to deal with - for all parties concerned - but don't forget to take care of yourself, too.