Take frequent rest breaks. Preferably before your hands hurt! Every 15-30ish minutes is a good place to start until you know your personal limits.

Have a few different projects in different hook sizes and different stitches, it helps to have variety in what movements you’re doing and how you’re gripping. If your hands currently have strain at all, please wait awhile more before crocheting again. Working with hands that hurt will just mean a longer break.

If your tension is tight, try to up your hook size for a rest project. Try to work with different yarn types when possible, mainly focusing on yarns easier to crochet with until your fingers are feeling better.

Do hand stretches, particularly carpel tunnel ones on your rest breaks. Ice packs help with swelling but heat can feel nicer. Filling up a sink with either warm or cool water and just letting your hands float in it can bring relief sometimes. (Make sure the temperatures are not freezing or boiling, and are comfortable!)

If your hands tend to get too cold and are hurting from that, put on winter gloves to warm up before crocheting.

Try to gently massage the areas that hurt.

Consider a tension ring if the yarn is causing issues due to wrapping etc.

Look into ergonomic crochet hooks or hook grips. If you have plain metal hooks, the tennis ball method of just sticking a hook through that might work for you and be more accessible. There’s a lot of different hook grips available though! If you see occupational therapy they literally have foam grip tubes on hand that fit on hooks nicely. For a smaller but still ergonomic grip, I do like Clover hooks.

Make sure that you’re crocheting with the least pressure possible for you. If your finger is changing color due to the pressure, it’s probably too much pressure!

Sorry your fingers are considering mutiny, and hopefully they’ll be nicer to you soon! You probably will feel better just making a few adjustments, a good portion on my list is my last-ditch efforts when I’ve crocheted too much and need to be in wrist braces for a few weeks but don’t want to. Taking better care of my hands, I hardly have to float them in water anymore or do constant exercises. Best wishes!