Breastfeeding and bleaching/dying hair

I would really appreciate some thoughts or advice.

Before pregnancy I was a compulsive hair dyer and used to love changing my hair every 3 seconds. This was my feel good activity.

Whilst pregnant, I went teetotal and didn't do anything drastic just in case of chemicals etc, so I now am completely natural, which is great for the health of my hair.

Fast forward to now - I have a little 3 week old baby, and breastfeeding exclusively. I am desperate to bleach my hair, just to get that feel good feeling again, especially as I'm not feeling my prettiest postpartum.

Now this has been a recent argument between me and the OH, he thinks if I didn't dye during pregnancy because of chemicals, why should it be any different while breastfeeding. He is so super supportive with everything but this is one thing he isn't budging his opinion on. He would say things like "you will be poisoning our baby" which makes me feel guilty for wanting this for myself. Postpartum isn't being kind to me emotionally, and despite wanting to feel good, my lil man comes first always. This makes me cry, thinking I'll be harming him.

I just wanted to know if anyone had resources, advice, thoughts, just anything. I'm planning on breastfeeding for as long as I can too.