So tired after class after taking small break. Any insight?

So a few months ago I started at club Pilates. Did the trial 30 minute class and loved it but felt so sore next day. Signed up for 1x a week.

Then while doing 1x a week, signed up for 30 minute weight lifting class 2x a week. Enjoyed that too.

Then following month, decided on Pilates 2x a week. And so i alternated between Pilates and weights during weekdays. Electrolytes daily and vitamins.

No problem- feeling great.

Then I stopped Pilates for a month, continued weightlifting, and went back today to a silver socks level 1 (I’m 40 but like the gentle classes). And I came home about 1 hour later (after errands) so tired and exhausted.

Like I’m starting to get anxiety bc I have a full afternoon of picking up kids and work tonight, I don’t know how I’m going to do it.

I’ve been laying in bed for hours taking cat naps periodically but I’m worried what’s going on.

I did eat some crap chips after class when got home which is extremely unlike me- I don’t think I’ve touched a chip in years.

Any insight???