@Slowbro
I think the first question is one that you could answer best. Would you be ok with perhaps experiencing some of the symptoms you experienced before, even if only temporarily? Panic attacks are a complicated topic.
Although there are traces of THC in CBD oil, the amounts are negligible, so you shouldn't expect any mind-altering.
The data on CBD is scarce, though it has been clinically proven to help with things such as seizures, arthritis, and inflammatory-based health complications. That said, there is a great deal of anecdotal evidence and personal stories out there, which shouldn't be ignored. For doctors to begin prescribing treatments in westernized medicine, there needs to be clinically-proven results that demonstrate sufficient benefit and minimized risk. Since CBD is relatively new, there isnt a lot of long term evidence nor evidence on humans, and so it may not be prescribed as much as it one day might. So, in short, although there may be benefits to taking CBD oil, there may also be problems lying unveiled in the dark. For example, CBD oil could react with other medications you may be taking, as this is yet to be fleshed out.
I live in Canada, and doctors here are permitted to prescribe CBD oil. I have personally used it to help me sleep. I found that it made me feel calmer, making for a better sleep; however, after a few days, it lost the ability to make me feel this way. I took more to compensate, which helped again, but I realized I would simply start taking more and more, so whether I needed more to experience the benefits or whether it was all in my head, I decided to stop taking it. I suggest getting medical-grade CBD oil if you decide to go for it. Try to avoid pot shops. They're often poorly regulated and inaccurate with their contents.
With all this in mind, I think perhaps the best course of action for you would be to have a conversation with a trusted healthcare professional if you're concerned about how CBD oil may effect you with respect to panic attacks.