Where I am today

So a few years ago I had cancer and did chemo, chemo caused me lots of anxiety maybe because of the particular meds they used in me. Never followed up on that medical end sadly as I was just trying to survive. Now my patience and anxiety sometimes gets the better of me and I will at times feel my heart uneasy, my stomach tight, and I’m unable to think clearly. I tend to get a bit snappy, withdrawn etc. It’s been a bit hard on my SO because I cling to her for emotional reassurance and she feels stifled. I don’t know how to become less anxious without requiring her presence. I have other coping mechanisms like journaling and listening to music etc but sometimes either they don’t work or I don’t feel as if they work. Where can I go from here to help improve myself and be less dependent on her? The things that cause me anxiety at the moment are social situations with groups of people, the thought of upcoming life events that require me to plan for them, and they just sometimes randomly happen.