It's impossible to diagnose someone via Just Answer but I would comment that based on what you have described it would be my recommendation that you undergo a specialist assessment for Bipolar mood disturbance. Many people experience unstable mood of a Bipolar nature that never develop the full illness and you certainly don't describe a set of symptoms that meet criteria for the full illness. However, you do describe a couple of symptoms that are consistent with Bipolar, the estimates of phase length are consistent and the age of onset is roughly what we often see, so......while it doesn't sound like you are experiencing full blown BPD you are describing enough similarities to warrant it being assessed.
It's really important that you be assessed as people with a vulnerability to Bipolar illness (or people who have a very mild form of it) can be very sensitive to certain medications and even some supplements. So before you go down the path of using any kind of compound (be it natural or pharmaceutical) I would suggest you at least have th e possibility of Bipolar Illness cleared.
I suspect that you do experience rather high levels of anxiety and I base this suspicion on the fact that you describe transient obsessive and compulsive symptoms - something that is often a sign of very high stress levels. How your anxiety processes are interacting with the mod symptoms you are experiencing would be something that needs to be determined through a more detailed assessment.
If what you are describing does turn out to be Bipolar in nature then it is impossible to make predictions about the future course of the instability you are experiencing. Mood disturbance is highly idiosyncratic and there is no way to predict future course based on theory alone. In saying that, Bipolar Illnesses usually have phases of relatively 'normal' mood. In fact, for most people these periods are far more frequent than the more acute symptomatic phases. Bipolar illness is very sensitive to stress and I wonder if perhaps you are more aware of the issue at the moment due to recent stressful events such as moving house/home.
Mild Bipolar disturbance can be managed without using medications so a trip to the Psychiatrist for an assessment would not necessarily mean commencing medications. How would you feel about getting a formal Psychiatric assessment?