If you had asked for assistance to move and the FA had declined to assist you, then you could potentially have a case, particularly if you then developed DVT. However, the law expects you to mitigate the impact of any impediment. It is incumbant upon you to make known to the staff your discomfort and asked to be accommodated. I don't think if you "suffer in silence" for the whole journey, and the airline was placed in a position of not being given the opportunity to remedy the situation they are likely to have any liability.
If however the impediment continued during the landing phase then they would almost certainly have been breaching regulations, as it is not permitted to block your means of egress.
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