Your doctor and about 99.5% of the doctors in the US are going to dismiss you and probably label you having Delusional parasitosis. At best they send you to a GI doctor for a colonscopy or stool test you. Most people receive false negatives on these tests and you go through the cycle all over again.
Panic arises out of the adrenals and can be mitigated through psychological support but likely the culprit is taxed adrenals.
Supporting the body with the nutrients it needs will help tremendously. Supporting the adrenals with adequate vitamin C and pantothenic acid (vitamin B5) along with other b vits, essential fatty acids will help you (and most other nutritional therapies)
Adrenal weakness causes stamina problems and will make you more vulnerable to attack (physically, mentally etc).
Adrenals become weakened due to stress especially if you have infection in your body.
Insomnia is generally caused by magnesium issues or calcium and magnesium. Magnesium is lost under any stressor and is closely associated with the adrenals.