If correctly treated,no need to be concerned...
If your BP has been steady at 190 mark (no drops), then, this is something to be concerned. Your hypertension
is not well controlled. I suggest to start a complete treatment with ACE-inhibitors, diuretics and to continue using Atenolol
(as you are already taking).
It will take 2 weeks for the improvement to appear, however, so far, you should've noticed some changes. As your BP is steady (up to 190), then, the therapy you are taking is not working. The drugs as suggested earlier are necessary to be added to your current therapy with Atenolol. If already added, improvement will be seen within the next 2 weeks.
Looking forward to have your reports in!