Something strange after tahajjud

Salam Alaikum, I'm a sister who recently began praying tahajjud (just 2 rak'ahs). Every time I finish, especially after the tashahhud, I get this odd sensation-like a powerful presence or energy. It makes me dizzy and almost brings on a panic attack. Has anyone else experienced this? Is this a good sign or something to worry about? I'm even feeling a bit scared to keep up with tahajjud.