Thanks for your reply.
Muscle stiffness,gastric upset, tiredness, heaviness and feeling of weight on shoulder areas (upper back and neck), lack of concentration are typical symptoms reported by anxious patients and your thyroid status is also fine which points more towards the possibility of anxiety disorder in your case. I don't think there are any significant medical test required at present on the basis of symptoms you have mentioned here.
In patients of anxiety disorder including GAD, I personally prefer to use SSRI antidepressants such as either Sertraline (Zoloft) or Escitalopram (Lexapro) in combination with Clonazepam. All SSRI during the initial phase of treatment may worsen the anxiety before controlling the anxiety symptoms and clonazepam can effectively control that anxiety. Once the patient start noticing relief the clonazepam can be withdrawn and can be used on as and when required basis.
I do agree with your doctor that you should consult a psychiatrist for proper evaluation and management. In the mean while till you are able to consult a psychiatrist, you can discuss with your GP / doctor about starting Sertraline 50 mg or Escitalopram (Lexaparo) 10 mg per day to be taken at night in combination with clonazepam. The dose of Clonazepam can be kept either .25 mg twice a day or .5 mg to be taken at night. .25 mg of clonazepam can be used as an extra dose to control any anxiety attack.
By starting this combination you should notice a good improvement within 7-14 days, then your doctor can increase the dose of Lexapro to 15 or 20 mg in divided dose depending on the clinical symptoms.
In addition to medicines, cognitive behavior therapy has also been found useful in patients suffering from anxiety disorder. You can also try free online Cognitive Behavior therapy in addition to the medicines.MoodGYM
Please let me know your thoughts about this treatment strategy.