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What you are experiencing is common when antidepressants such as Cymbalta are stopped suddenly. This is known as SSRI/SNRI (the class of medications that Cymbalta is in) withdrawal syndrome or antidepressant discontinuation syndrome.
These symptoms are very unpleasant but there is no risk to your health unless you begin to develop severe depression and have ideas of suicide. Usually these symptoms will pass within 1-2 weeks. In general, it is recommended that antidepressants such as Cymbalta be tapered gradually over 4-8 weeks to help prevent this reaction, but I understand that you are concerned about the health of your fetus and it is common for women to stop their antidepressants suddenly when they learn they are pregnant.
Therefore, I would recommend being patient, trying to rest, stay well hydrated and "riding it out" for the next week or two. Tylenol is safe during pregnancy and may help relieve the headaches, chills and general discomfort you are experiencing.
Best wishes to you.