Today 5/18 BS out of control

Wokeup with a bs of 244, took my regular mets, went out and walked 2 miles BS after walk 207
went and had Breakfest did some shopping before lunch BS 346. Finding it hard to stay awake.
going to eat lunch and take additional meds
Reached over 400 lunch went and got my Insulin refilled started over with new bottle
down now to 280

Any chance your insulin has gone bad?