What Causes Discomfort In Armpits At Night And Pain In Bicep And Forearm?

Hi i hope you can help. I have a discomfort in both armpits which is noticeable at night when I lie down. the best way to describe it is that it feels as if my Tshirt is too small and is constricting me just under the armpit. But when I take my shirt off, it stays tight/uncomfortable. Coupled with this, when I wake up, I find I difficult to extend my hands and fingers. It s as if my tendons are freezing up overnight. Tonight I have started getting a swirling pain in my bicep and forearm on my right side. It s not constant, just once in a while. Like my muscles are cramping slightly. These pains are causing me to feel very anxious. I am 37 yrs old, male and weigh 83kg. Thanks in advance.