This first thing a psychiatrist will want to do is rule out and drug or alcohol abuse, as well as look at any any prescription or OTC medications, herbal supplements your currently taking. It sounds like the ED ruled some organic causes of your symptoms, however a psychiatrist would be able to do a more extensive differential diagnosis to rule out medical and environmental causes. Talk to your GP about switching the lisinopril to a eta blocker, which are often prescribed off label to treat anxiety as well as to treat the PVC/PAC particularly if tachycardia is co-occurring. The tingling is most likely a result of hyperventilation. try straw or bag breathing. The Jaw pain is probably resulting from increased muscle tension, there are many relaxation exercises you could to help, chewing gum may also provide some relief. I would bet it is anxiety disorder specificity panic disorder. Although the obsessive thinking and worrying could be indicative of OCD. Even though you had not experienced trauma around the onset of the symptoms, it could very well be post traumatic stress disorder(emphasis on the post). The most effective treatment for any anxiety disorder is a combination of Cognitive behavioral therapy and the use of an antidepressant preferably an SNRI, but some SSRI s are equally as effective. Stay away from any benzodiazipines the are habit forming and withdrawal can occur in as little as 3 weeks of use and can be life threatening, and can leave you with protracted rebound anxiety worse then before the treatment. That said if your symptoms become so severe that they interfere with your activities of daily living then benzo s can be an effective short term treatment What your describing could be a number of psychiatric conditions other then anxiety as well, but a full psychiatric assessment would be necessary to rule those out. Above all, when your experiencing symptoms remember that they are transient and will shortly dissipate. I know how scary and even debilitating anxiety can be, just remember it is very treatable especially when treated with a combination of medication and cognitive therapy. Please let me know if you have any more questions or I can be of further assistance. Hope that is helpful.