Trying to fix my (34F) marriage in quarantine with my husband (41M) and our baby (1M)

Quarantine has forced me and my partner to face the issues between us - 7 years of slowly built up resentment. It hasn?t been easy these last 5 weeks to be locked in together. Just now we had another terrible fight where I was condescending, he was resentful, and it?ll just be another bit of dead weight added to the dead weight scale that we?re dragging along in our lives.
I honestly don?t even know where to begin. All our issues are entangled and it?s not easy to see what is actually going on. In terms of dark horsemen: I?m the contemptuous criticising one, he?s the defensive stonewalling one. We have terrible communication and rarely manage to solve issues between us.
I really don?t want to break up. I think I?d run into the same issues with someone else, and I?m guessing that relationships are just hard most of the time. He?s also expressed not wanting to break up.
What can we do to survive the lockdown and to fix our marriage? We?re so stuck.
TL;DR After 7 years of marriage we (34F and 41M with 1M child) have lots of issues piled up. We want to make it to the next seven years but are really struggling to keep it positive.
Edit: between work and our toddler the Dating.mobi windows are fairly limited, so it might take a while before I?ll be ably to respond to everyone. I?m so grateful for everyone?s advice. Couples Therapy sounds like the way to go and the fact that it?ll have to be over the phone might actually make it easier for us to find the time.
Edit 2: omg thank you SO MUCH for all your perspectives. Apart from it all being really insightful it also makes me feel so good to hear so many people?s opinions. The lockdown really means you can only talk to a handful of people and I?ve missed this so much! I?ll gradually try to reply to each of you!
Oh and something that deserves a clarification: our child is 1 year old and male (1M) not 1 month old.


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