Have I bought the wrong shoes??

Hi! looking for some advice

So, I a 29 year old female and have been a regular gym goer for the last year with the intention of losing weight - lost 70lbs so far, doing a mix of cardio and weights training. I always did my cardio on the cross trainer because frankly running has always been something I have been terrible at and it always gave me anxiety. (I have asthma and a heart condition and that has held me back in the past and I always just steered clear of running). Recently though I have been feeling in better shape and wanted to start working on running.

I try and run 5k twice a week (takes me about 38 minutes as I am not yet able to run the whole thing without slowing to a walk every few minutes and I am not very fast just yet) but I generally do at least 25 minutes of running 5 days a week. (always on a treadmill). I was wearing Adidas Women's Duramo Lite 2.0 running shoes and I liked them a lot but found the back wore away very quickly and I was getting really bad blisters on my heel (blisters inside blisters.... it was a nightmare!) - particularly on my right foot and it was getting out of hand.

After this happened with 2 pairs of shoes I decided to invest in some more expensive running shoes and went in to RunnersNeed to have them assess my gait etc. They filmed me running and told me that my right foot was neutral, but that my left foot was rolling in and could use some stability. They suggest a pair of Brooks Adredline GTS19 shoes which they said would provide stability for the left but not overcorrect on the right.

I bought them on a Friday and ran with them the following Monday. No blisters (yay!) however after the first run I experienced quite bad knee pain with my left knee as well as pain in both shins (though worse on the left). I assumed it was just a case of getting used to them and continued to run Tuesday-Friday that week. I gym and run in the morning and then walk 4 miles home from work and by half way through on the evening walk I was finding it so bad that I had to get the bus the rest of the way. I kept persevering and it just didn't seem to get better.

I've now had a full 7 days that I have not been to the gym or been running and have still been wearing the shoes to walk around but not done any particularly long walks. The knee pain is finally nearly gone and my shins aren't too bad, but I am worried it's all going to come right back as soon as I try and run again.

Have I just spent £120 on the wrong shoes? Is it just an adjustment thing that will go away if I keep going? Am I at risk of injuring my knee if I continue?

Really hoping I haven't splashed out on the wrong shoes.... had to save up to get them and won't be able to afford to replace them any time soon...

appreciate any advice or guidance here!!