Can I find out what exactly I’m reacting to and is there an alternative to Botox? (Photo)

I have tried a few different brands and techniques and also had some placed into my arm to try and find out why my eyes become puffy a week or so after. I seem to be allergic to it as I still had a slight puffyness to my eyes even when I had a small amount in my arm I’m wondering why the swelling is happening and if there might be something else I can try that has the same effect in the UK? I’m so disappointed. Would taking antihistamines every day make a difference? Or is it dangerous?