I had exactly the same situation as you before, now my two boys are
7 and 3. Both of them got mixed feeding. I have also tried all sorts
of methods to increase my milk production
, in the end, both of the
boys are mixed feed until 6 months old when my milk exausted. Yes,
I needed double works for these months, but I felt very happy to feed my boys as long as I could. Plus, I think human milk will help baby digest.
Do not feel any guilty that you do not have enough milk for your baby,
as you have tried hard already.
For you, few weeks do not mean too much, do keep up the hard work!
You will appreciated yourself for not giving up.