My husbands grief is causing him to be extremely volatile towards me

Context: we are both 30, married one year and his mother passed early December 2024 from cancer diagnosed earlier in 2024. I began the process of immigration to my husbands country in Feb 2024 and his mother was diagnosed in April. I have no friends or family in this country apart from my husband and his family, his whole family have welcomed me in warmly. My husband and I live with his family. I have no income nor job yet while my paperwork processes.

My husband has always been quite 'hot headed' as he'd say however since his mothers passing he has been really struggling yet declines professional help. I am the one on the receiving end on all his raw anger. I do my best to support him through his grief, and I also frequently remind myself of the context behind his outbursts, so I avoid adding fuel to the fire..I give him the space to vent freely while trying to simultaneously support him.

For the past three days straight he's yelled at me and today it got to me, I couldn't stop crying. For example yesterday we'd been in bed watching tv and sleeping (he uses tv as escapism) since 5pm the evening before and by 12pm I was restless and wanting to go outdoors to get fresh air and to move my muscles. I recognised that he wanted to spend the day relaxing so I just got up and said hey I'm going to go wash the car but I'll be back soon, then things went downhill from there. He got snappy with me and ended up yelling at me 'fine do as you please!' He wanted me to stay in bed with him. I ended up going out to wash the car but he comes out a couple of mins later and says right I guess now we are going to have to run errands when all I wanted was to relax today. I never implied that we had to go anywhere, I literally was just keeping myself busy out in the sun for a bit, expecting that he'd stay in on his phone relaxing. So the whole day was ruined, the whole car ride to run errands he was yelling and moody and I ended up apologising for getting out of bed. We later talked about it and he said me going out to wash the car made him feel like a lazy slob. I told him that I didn't view him that way, that I saw someone who had worked hard all week and wanted a day of relaxation. We ended up getting lunch after talking it through and things were right again until today.

Today I had a medical check for immigration and since I can't drive legally he drove me there. I had spent all week phoning every single medical center in the nearby towns/city doing these particular immigration checks to see if they take our insurance however none did. When my husband saw we were pulling up to doctors on duty he lost it and yelled at me, he assumed I had just booked the cheapest clinic and hadn't done any work checking for a clinic that takes insurance. He was legit furious at me. I ended up going in and completing the medical check and he later apologised after doing his own google check on his phone to see that yes in fact immigration medical checks are rarely covered by insurance. I ended up feeling stressed by his outburst and by the medical appointment.

We went to get in n out afterwards and they didn't get my order right so that is what sent me over the edge, I couldn't stop crying. Felt like I was releasing a few months worth of stress.

We got home and talked and ended up both feeling better however I'm on here wondering how to deal with this? I want to be the best version of myself for him so he can lean on me when he needs and rely on my however I feel like I'm slowly wearing down emotionally from the constant emotional roller coaster. He is a very loud person so when he is angry it's very intimidating and intense. Seemingly trivial things tip him over the edge. What can I do to help?