Severe itching, no rash

Some of the standbys are hydrocortisone cream, calamine lotion, baking soda paste or bath, oatmeal paste or bath. Talk to a pharmacist or maybe your healthcare system or insurance has a 24 hr nurse line? There’s urgent care centers too.
It may be internal though which they won’t really deal with, so cleanse your system. Eliminate sugar and excess salt, eat greek yogurt and a probiotic to balance your gut. Drink 8 glasses of liquid each day to flush your system, no fruit juice or sodas as they’re high in sugar. Have 1 tablespoon olive oil and also coconut oil or milk. Green tea and ginger is also good for balancing your system. Do some online research on herbal teas that may be specific to that. Hope this helps

An important part of your history is your medication history including
over the counter products.
You may need to consult a dermatologist if your PCP doesn’t
have a solution.

I take antidepressants, BP medicine and use a daily inhaler. I use acetaminophen for the occasional headache and Zyrtec for allergies. Over the past several months, I've had shortness of breath upon exertion. I meet with a pulmonologist early next month, but in the meantime my GP prescribed the inhaler, which has provided much relief. I'm not sure if the breathing and itching issues are related...

Try benadryl

Good advice from the people above.
Ok, have you started anything new. How about a new jar of something you have been using for sometime.
Read labels anything new on list. Any time I see on a label new and improved. I questioned what they did to the item I’ve been using.
I was told by a doctor a Derm doctor to use five parts water, one part vinegar under my arms for a BO it works Just do it a few days at the beginning then as needed.
It could be something that’s in the air at this time of year. Do a diary of your symptoms and see our track your day
If it gets worse at any time of day, check what you are doing eating and wearing I think you’ll be able to figure out what is going on. Be your own detective.
Itching and hives of any type are no fun.
Call your doctor they might be able to give you something.

Have you looked for possible side effects associated with the antibiotics you were taking? Rxlist.com is good place to look . Try to think of when exactly the itching began ; have there been any changes in your entire environment? Any new or different additions inside your house, car , especially bedroom or places you spend a lot of time. Any new food or drinks? Is it only itching? What about a burning sensation under the skin? Look at the scary things list more closely and see what seems most likely to be a contributor. Is your skin dry or becoming rough to the touch . Lots of questions. You need to adopt a Sherlock Holmes attitude for a while. Very tedious but often really helpful , I have found personally. Good luck.

@kimmiesue

My daughter had body and facial itching recently and discovered through research that Histidine was the culprit. She takes a collagen powder plus another powdered supplement both of which have a ton of amino acids. Just 2 days after stopping both supplements the itching went away. She is a Nurse Practitioner who knows her chemistry but still had to research possible causes. So a lot of research is necessary on your part. You may get some relief from all the good suggestions here but , as someone suggested, you need to play Sherlock Holmes. Either that or go to an allergy specialist with all the meds or supplements you take. You need to find the root cause .

FL Mary

Sounds very similar to aquagenic psoriasis. The only thing that helps is Beta Alinine, it’s a pre workout supplement that is available in tablets or crystalline powder at GNC or Amazon. Takes about 40 minutes to work. You feel heat or tingling in your ears first, then relief( if it is aquagenic psoriasis.
I usually take 1-2 a scoop or 2 tablets. A bag of Frozen peas is also good for temp relief.

I second the advice on Beta Alanine. I get random itch due to change in temperature, even a slight change…I take 750 mg of beta alanine and it kills the itch for 4 hours…there is a sustained release version of beta alanine that I want to try…if you take a large dose you can have tingling of the skin, so if you r going to try it, start slow…I buy the NOW Brand from Amazon and have been using with no side effects for 7 plus years…

For almost instant relief, freeze your itchiest areas with a large zip lock filled about a quarter of the way with ice cubes. Repeat if you need too. This was my saving grace and go to before I found that 3 Allegra (fexofenadine) a day took care of it.