While currently only indicated for upper eyelashes, Latisse has been used off-label for the eyebrows and lower lashes. Many of my patients have used Latisse successfully for enhancing their thinning eyebrows. There is likely an adequate amount of product that gets transferred to the lower lashes through blinking, so probably do not need to apply directly.
It is perfectly fine to have both Juvederm and Restylane injected either at the same visit, weeks later, months later. They are both hyaluronic acid fillers and can often be used interchangeably.
As discussed by the other physicians, the Restylane may have been placed too superficially causing a swelling or ridge under the eye, or may have migrated to the area. Often there is also a bluish hue if the filler is too superficial. I would return to see the injecting physician (or another reputable physician if you prefer) to be evaluated. An injection of hyaluronidase can help to dissolve the filler if necessary.
I agree with many other doctors on the panel - you can certainly get only the frown lines injected, but often the "Spock" eyebrows can occur when only injecting that area. One or two units injected above the lateral brow can help to avoid or fix this problem (should not be considered a new "area" or "location"). An experienced physician should be able to guide you in deciding what is appropriate for you. Many physicians do not charge by the "area" which may help with your financial situation and give a little more room for individualizing your treatment.
Unfortunately, hyaluronidase only dissolves hyaluronic acid based fillers such as Restylane, Perlane and Juvederm. There is currently no agent that helps to dissolve or reverse the effects of Radiesse - only time. Since Radiesse is not reversible and typically lasts longer than hyaluronic acid fillers, it is important to have the injections performed by an experienced, skilled physician.