I use CBD oil and sometimes I'm wondering how much it helps. Sometimes it seems to if I feel slightly foggy and I hold it under my tongue for a minute. I notice that it is wonderful for anxiety or stress.
If I am way brain foggy, having extreme virtigo, or a limb is twitching/moving on it's own - I find chewing the bud straight from the plant is the most effective. Awful tasting, but starts working for me super fast - generally within 5 minutes. I'd rather take that over a benzo any day.
I have never had worsening symptoms from full-spectrum CBD oil or from the plant itself.
I use Lazarus Naturals (they also have a program that if you have state assistance and can provide proof, they will discount their product). Although, one time we did get a bottle and thought, "This isn't helping at all. It didn't taste as potent as it normally does, didn't smell the same." after a while, I wondered if it was not full spectrum or a pirated version from the company itself? We will never know. We didn't suspect anything was wrong with that bottle until we got another one and realized there was a HUGE difference. So, perhaps take this with caution. I have heard Charlotte's Web is ultimately the best of the best, but it is expensive.
Generally, you'd want a high CBD and low THC strain. The Lazarus Naturals contains 50mg of CBD per ml.
If you look for a plant strain to buy, be sure you're getting that high CBD/low THC.