Relationship Breakup are known to have these effects, what you going through is various stages of grief reaction due to loss of relationship. This can be associated with anxiety and depression symptoms. Important thing to remember is these symptoms keep decreasing gradually with time, with will, motivation, new friends or relationship can fasten the process. Of course never lose hope
Next Steps
in case you find it very difficult , suggest you consult a therapist, therapy and medicine temporarily can smoothen the process