almost quit but changed my mind. HELP!

We struggled w/ DS gaining weight, so I went to EP'ing to make sure he was getting enough.  I struggled to produce enough & in order to pump what I was I had to pump for 30min each time because of poor let down.  I suspect my poor let down was part of our nursing problem too cause DS used to just scream when I put him to breast in the early days.  I tried a lot of things to increase my supply but with no success.  Recently my freezer stash ran out & we had to start supplementing.  It has been exhausting & stressful trying to pump & very discouraging that I can't make enough.  So I thought to myself "give yourself credit for what you've done & just switch to formula" but after a few days of dropping sessions, I was starting to feel very weepy.  I cried every time I thought about it. I'm not sure if it was a hormonal thing or mental, but I decided I'm not quite ready to give up.  However, my supply is dwindling because of how much I had weaned off the pump.  Work makes it difficult if not impossible to get in the pumping schedule I need to try to increase my supply.  Part of me says I just have to do what I can at home & whatever I get I get, but this stubborn part of me wants to regain what I was producing before.  I know the best thing is to nurse baby but because I EP'd early on & he's had bottles, I don't know if he'll have much interest in nursing.  I don't think he'll have the patience either since he's not going to want to wait 5-10min for a letdown.  Am I crazy to be trying to regain my supply?  Is there really any hope that I might be able to regain a nursing relationship at this point?  I think time is my biggest enemy.  I work FT & have 2 other young children at home.  It seems pretty selfish to put everyone else aside to dedicate all my free time to reestablishing supply and/or nursing.