Boodica,
The eclipse on 16th August activates your natal minor grand trine (jupiter + uranus + neptune).
Progressed mercury squares natal jupiter and forms a yod with natal uranus/neptune
Progressed 5/11 axis is conjunct natal jupiter and natal 6/12 axis
Progressed 6/12 axis squares natal and progressed neptune
Progressed ascendant is conjunct natal/progressed uranus.
So, your natal minor grand trine is also activated by progressions
Transitting uranus opposes natal uranus three times over the next 12 months (then goes on to trine natal jupiter and neptune).
So, a major transit is also activating your minor grand trine - and transitting neptune enters your 7th house this year
In summary, what this August eclipse appears to be heralding for you is the arrival of the uranus half-return - the possible effects of which are probably known by you (and are well documented if not). Although it is always a time of uncertainty/confusion, the outcome is invariably beneficial. But, for you, the minor grand trine should make this half-return much easier than usual.
All you need do here is to "go with the flow", knowing that whatever happens will be for the best - and it may not even be unsettling in your case. However, neptune will be asking you to view 7th house relationships more realistically than you perhaps do now - and there the comments of Sheila and Tikana seem particularly appropriate.