Jupiter is your Lagna lord. It is a natural benefic and being the Lagna lord, it will not cause much harm. However, it has its weak points:
1 It occupies a Kendra creating a Kendradipatya dosha
2 It is retrograde and its effects become unpredictable. A general feature of retrograde planets is repetitiveness. Any event may not happen right the first time.
3 It is associated with Saturn who is the lord of the 12th house (its moolatrikona house) of loss and expenditure.
4 Its nakshatra lord is Sun who is in its exaltation house but is also the rogakaraka. This nakshatra lord joins Rahu in the Navamsa in the 4th house of Navamsa but in the 8th from natal lagna causing sudden disturbances.
In the dasa of Jupiter, Sun and Mercury are automatically activated. With Mercury occupying the 6th house of Navamsa and Sun the 4th (in its debilitation house) differences with all and sundry can be expected.
Moreover, with Jupiter occupying Lagnamsa (from natal lagna) in Navamsa, some physical ailments can also occur. All the more since both the maraka houses (2nd and 7th) are also activated.
You can start reciting Aditya Hridayam Stotra and Vishnu Sahasranama Stotra daily with a prayer for relief from these issues.