I've been trained in something similar - TFT (Thought Field Therapy). As Patti says, these approaches are fine ad adjuncts in most cases but a couple of things I would suggest checking on would be is the therapist also a trained, licensed therapist in some major field (psychology, social work, counseling) or is this just someone who has taken some training in EFT. That's important IMHO because sometimes material can be brought up and EFT is only one of the approaches that's needed. A skilled, licensed therapist will know how to deal with difficult life issues (such as past abuse) that may arise. Someone only trained in EFT or hypnotherapy or anything alone may not. Same thing with EMDR and several other of what are called the "alphabet therapies".
Second, I would make sure you're not getting taken to the cleaners financially. If it's the same reasonable amount a therapit would charge, that's fine, but some people will try to charge hundreds of dollars for one session. That should be a red flag.
If done by a licensed therapist, these techniques are usually integrated with overall therapy and probably will be covered by insurance.
It's also ok if you're seeing a "regular" therapist and someone else for EFT, so that way they can coordinate. And if something too painful or scary comes up, you have a regular therapist to fall back on.
That being said, if you're getting some relief it generally can't do any harm (unless someone bleeds you financiall!). My belief is that mind and body are not separate, but are always having "conversations" with eachother via various body systems. It's no accident, for example, that data on second heart attacks show most were preceded by an anger outbursts. Emotions have physical components.
I'd do what Patti suggests and sign up and learn about
various techniques, but also trust yourself. If something sounds too good to be true, it likely is.