-Panic disorder
-Obsessive-compulsive disorder (OCD)
-Post-traumatic stress disorder (PTSD)
-Social phobia (also called social anxiety disorder)
-Specific phobias
-Generalized anxiety disorder (GAD)
Most people struggle with GAD or Social Anxiety. In most cases of PTSD, it has happened after some traumatic life event like rape, attack/assault, or in soldiers returning from war. In a popular movie "Iron Man 3" the main character Tony Stark suffers from PTSD, resulting in anxiety attacks, insomnia, unnerving feelings, exhaustion, migraines, etc.
Panic attacks caused by anxiety usully feel like physical pain; I.E., tight chest/chest pain, tight muscles, clenched jaws, you feel jittery, fidgety, panic, fear, anger, sadness, neurotic behavior, yelling, crying, intense emotions.
Anxiety also makes people feel like they're out of control of their emotions and feelings, and that's a huge part of controlling disorders like OCD. OCD is often linked to extreme germaphobia. The need to organize, move things, touch things repeatedly or even clean is linked to needing to be able to control everything around you like germs and object placements.