I'm doing some "retail forex" by (for example) exiting hydrocarbon-dependent currency and entering one weakened by parting the political union but ought to bounce back. As you see, I'm basing my strategies on fundamental analysis and it works but only within 1-2 month timeframe minimum. However, I retrospect a number of 1-2 week trends which could bring me some profit if carefully planned. So my question is just as in title: which technical indicators are suitable for medium-term strategies?
If I knew a surefire way to make money in FOREX (or any market for that matter) I would not be sharing it with you. If you find an indicator that makes sense to you and you think you can make money, use it. For what it's worth, I think technical analysis is nonsense.
If you're just now wading in to the FOREX markets because of the Brexit vote I suggest you set up a play-money account first. The contracts and trades can be complicated, losses can be very large and you can lose big -- quickly. I suspect FOREX brokers have been laughing to the bank the last couple weeks with all the guppies jumping in to play with the sharks.
Speaking from stock market point of view, superficially, TA is similarly applicable to day trading, short term, medium term and long term. You may use different indicators in FX compared to the stock market, but I would expect they are largely the same types of things - direction indicators, momentum indicators, spread indicators, divergence indicators.
The key thing with TA or even when trading anything, is that when you have developed a system, that you back test it, to prove that it will work in bear, bull and stagnant markets. I have simple systems that are fine in strong bull markets but really poor in stagnant markets.
I urge caution over your statement
... one weakened by parting the political union but ought to bounce back ...
We (my UK based IT business) have already lost two potential clients due to Brexit. These companies are in FinServ and have no idea of what is going to happen, so I would respectfully suggest that you may have less knowledge than professionals, who deal in currency and property ... but one premise of TA is that you let the chart tell you what is happening.
In any case trade well, and with a plan!