Generalized itching for five months. No rash, normal blood work, no allergies have been found. Do I need to be worried about Hodgkin's lymphoma?

See derm. Although lymphoma is a possibility, it is by far not the more common causes for itching. If you have lymphoma, you will have other symptoms (fatigue, weight loss etc) as well.

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Generalize itching, normal blood work, could I have Hodgkin lymphoma?

I bet you don't. The first step in the workup for generalized itching is to change whatever you're using to wash your clothes. If this doesn't provide an answer, look at the distribution and your relation to other exposures, especially light. I trust your skin is normal and there's no evidence of ectoparasites. Hodgkin's is VERY low on the differential diagnosis without a mass / fever / wt loss / sweats.