I'm hearing a lot of advice about tightening up and only playing primo hands. This advice sounds good and will almost certainly stop the bleeding in cash games but does little else to get you back on track. In tournament play it's just plain wrong.
But the problem with this sort of advice isn't so much that it's good bad, just useless. It presumes that you're current down swing is due to how tight or loose your playing when when success or failure is rarely that cut and dry. Based on the information you provided in your original post we know absolutely nothing about your style of play. Nor is it relevant.
The most important statistic in tournament play is ROI and not cashing in 20, 30 or even 40 tournaments in a row is in itself meaningless if you later cash just once for a net gain. In cash games, such losing streaks are more problematic and more indicative of a problem.
Either way, it's always more productive to explore the possibility that there's more going on than just a run of bad luck. One should never just assume that any prolonged streak of success or failure is the result of exceptional skill or lack thereof. You should always be evaluating your game reguardless of current trends.
Still, prolonged losing streaks do have a tendency to inspire doubt and lack of confidence which may not be an accurate reflection of true ability and as such canm be the cause of subsiquent poor results. If this is the case then the best advice I can give is to take a break. A week, a month, whatever it takes. Read some books, review some tournaments or sessions and when you come back, concentrate on one game at a time.
Despite conventioinal wisdom, IMO, multi tabling is a major distraction, and very few people have the ability to successfully focus on more than one or two tables at a time. Focus on one table, get to know your opponents and give yourself credit for good situational calls despite the end result. Remember that for most of
US poker is entertainmentan not an investment. If your not having fun, give it up.