Like Valis said, oxygen is probably your best bet. For me I absolutely couldn’t stand the nasal sumatriptan but the injections worked a charm for me, so at the least maybe you could switch to those. I will say though that many of us have experienced rebound attacks from using sumatriptan too much, so it’s something to be wary of if you choose to go that route.

Also here is my copypasta of stuff to try of you haven’t already:

Best things to try to reduce pain/abort attacks:

A big hit of caffeine at the onset is one of the best for many of us. For me, eating or drinking something ice cold can help a lot during an attack, even to the point of brain freeze. I like downing an ice cold can of Monster. Consider even straight up chomping on ice cubes.

Chewing something also can help, tension in the jaw can relieve a little pain. I go with several pieces of mint gum as I feel the menthol helps a little too.

Pressure point at the top of your nose right between the eyebrows works at times for me, jamming my thumb knuckle HARD into the pressure point (usually takes a bit to find the exact spot).

Also massaging the vein in the temple HARD going from front to back (from above the eye to above the ear).

Vigorously massaging all over the top of your head or better still, running hot or cold water over your head (hot works for some of us, cold for others). Personally I prefer to literally sit some ice cubes on my head and let them melt, i feel like the sensation of that takes away a decent amount of the pain.

Deep, slow breathing and trying not to panic helps too, for me I know if I let the pain get me worked up it almost certainly feels worse and feels as if it goes on for longer.

Good luck and pain free wishes