Anxiety cycle and Manic Depression?

i go threw these phases where i start to feel increased anxiety and it starts like a panic attack but not to severe i can control without xanax but always helps i just get in this funk and have more and more symptoms for days on end like wobbly legs loss of concentration heavy arms and legs trouble focusing and tension headache and the derealization feeling during these days i constantly think something is more wrong like brain tumor or undetected disease. i notice it is hard to swallow and my sleep patters are off like i sleep more or wake up more than often and overall feeling of dread.. im 28 male 190 pounds had blood work and urine test done 3 months ago and everything was fine. also i get fatiqued and muscle weakness and find it hard to start my day during these episodes if some could shed some light would help