I get some wild forearm pain if I work too long on a laptop (coffee shop, on couch with dog), or if I hold my phone too long (Pokémon Go, there are literally do

I get some wild forearm pain if I work too long on a laptop (coffee shop, on couch with dog), or if I hold my phone too long (Pokémon Go, there are literally dozens of us.) In particular, it really seems to be in my brachioradialis muscles. I tried out one of those generic massage guns at a friend’s place. I had scoffed at the infinite variations I saw advertised on Instagram, but I tried it on those small muscles and: wow. It helps me a lot. I can really massage out my forearms. There’s no way it's strong enough to work on knots in big muscles like quads, but for those little extensor muscles? Seems to help me. I’ve also been helped by what are called, broadly, “tennis elbow compression pads”. (Linked to Amazon below—not recommending this particular brand, it’s just what I have.). I wear theses at night if I’m having pain, and it seems to help. Now, the actual solution to my problem boils down to “use a full keyboard and mouse, and don’t bend your arms like a t-rex”, but, well, Pokémon. (https://www.amazon.com/Tomight-Elbow-Brace-Tennis-Compression/dp/B087B6YR9L https://www.amazon.com/Tomight-Elbow-Brace-Tennis-Compressio...)