Potassium deficiency?

Planning on probably making a dr appt but how do you know if you have a potassium deficiency. I’ve had them multiple times in er but was dealing with so many things I didn’t notice the signs. I’ve had three bad flares now in 8-9 days. My muscles keep twitching my hr will get elevated I’ve had an increase in palpitations I’m shaky. I’ve tried increasing electrolyte mix but feel like I just feel worse after and my heart has more palpitations. My husband doesn’t think I need to go get this checked and he doesn’t wanna take me but my mom will if I need to. Idk if this is worth checking. I feel like I have panic to go to Dr office or get blood drawn so I don’t want to but I have had three times in the last 3 years where it’s been low so I get nervous. I have kidney issues so I think I have a hard time retaining potassium even though I eat a lot of fruit and potatoes and veggies with potassium