Adjustments at work

Recently diagnosed and first time posting! Hello! 

I am having difficulty at work in so many ways and desperately want to keep working. One is the main things I really am struggling with at the moment being able to use a headset for meetings and things over teams as I get so distracted by background noise around me, get really overwhelmed and then cannot focus or concentrate, so I loose my ability to engage in a conversation which is obviously really affecting me. I spoke to IT department today about getting a noise cancelling headset but been told anything like that has to go through HR as a reasonable adjustment and would have to provide medical evidence etc I don’t know how I feel about being open about my diagnosis at work and how it affects me. Any experience with this? Positive or negative? 
anyone tried a noise cancelling headset? Did it help? 
Any other suggestions to try? 
thanks!