Regret 😩

So my daughter is 3 weeks old and we've had a rough start to our bf'ing journey which led me to exclusively pumping. Well, this past Saturday I had just had enough of trying to pump every 2-3 hours and keep up with my 2 y/o, so I decided to stop cold turkey...used the cabbage leaves and everything and haven't nursed or pumped since. Now my daughter is so gassy and just blah and I feel guilty and want to start back up with the pumping. Luckily I never stopped leaking, but Will my supply be permanently diminished after taking a 4 day break? How can I get back to producing what I was before stopping??