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Unfortunately, the answer to your question is that you would most likely not be able to sue the friend for psychological damages you suffered while away. Those types of damages, also called non-economic damages, are very hard to prove and litigation of the matter could be costly.

That being said, if you suffered economic damages such as lost wages, medical bills and things of that nature which were due to your friend's negligent actions, then you may have a better standing to file a personal injury lawsuit.

It's best to speak with a personal injury attorney about the specific facts and circumstances of your situation. Most offer a free consultation, so you won't have to pay anything.